NOVELTY - Vertical tower type multistage circulating linkage high-efficiency fermentation system comprises a first-stage fermentation system and a second-stage fermentation system. A mounting position of the second-stage fermentation system is higher than that of the first-stage fermentation system. The first-stage fermentation system is connected with the second-stage fermentation system through a water guide pipe. The first-stage fermentation system comprises a first-stage fermentation pipeline, a material outlet cylinder and a material inlet bucket set on the first-level fermentation pipe.    USE - Used as vertical tower type multistage circulating linkage high-efficiency fermentation system.    ADVANTAGE - The high-efficiency fermentation system: performs synchronous fermentation of the first-stage and the second-stage fermentation systems to promote biogas slurry to circulate in the system, hence the stirring of the biogas slurry is promoted, the uniform distribution of strains is promoted; and improves the fermentation efficiency.    DETAILED DESCRIPTION - Vertical tower type multistage circulating linkage high-efficiency fermentation system comprises a first-stage fermentation system and a second-stage fermentation system. A mounting position of the second-stage fermentation system is higher than that of the first-stage fermentation system. The first-stage fermentation system is connected with the second-stage fermentation system through a water guide pipe. The first-stage fermentation system comprises a first-stage fermentation pipeline, a material outlet cylinder and a material inlet bucket set on the first-level fermentation pipe matched with an opening. The material outlet cylinder is set and extended at the bottom of the first-stage fermentation pipeline and separates a clapboard. The material inlet and outlet cylinder is separated into a first-stage feedstock tube and a first-stage discharging cylinder. The sidewall of the material outlet cylinder is extended into first-stage fermentation pipeline with biogas fermentation liquid. The first-stage fermentation pipeline is provided with multiple retaining plates. The side wall of the material outlet cylinder is set with air resistance plate formed between each fermentation zone, the one side of the first-stage fermentation pipeline is connected to gas guiding pipe of the each fermentation zone. The second-stage fermentation system comprises a second-stage fermentation pipeline, a second-stage feedstock tube, a second-stage discharging tube and a hydraulic pressure room. The both ends of the second-stage fermentation pipeline are respectively connected to the second-stage feedstock tube and the second-stage discharging tube. The second-stage feedstock tube and the second-stage discharging tube are inserted into the second-stage fermentation pipeline. The side walls of the second-stage discharging tube and the second-grade are set below the biogas slurry liquid level of the second-stage fermentation pipeline. The upper part of the hydraulic pressure room is set with the second-stage fermentation pipe. The hydraulic pressure room and the second-stage discharging pipe are connected with a discharge pipe in horizontal position. The second-stage fermentation pipeline is set with multiple air resistance plates located between the second-grade feedstock tube and second-stage discharging pipe. The sidewall of the air resistance plate is set with second-level inlet/discharging tube pipe adjacent to the each fermentation zone and is formed between the fermentation zone. Each fermentation zone with second-grade fermentation pipeline is separately connected to the gas-guide tube. The top part of the discharge pipe with a check valve for controlling the inflow hydraulic pressure of the biogas slurry in the second-stage discharging pipe. The first-grade fermentation pipeline and second feedstock pipe are connected with a first water guiding pipe. A second water guiding pipe is connected between the first-stage fermentation pipeline and the second-stage discharging tube. The first water guiding pipe and the second water guiding pipe are set with a one-way valve to control biogas slurry unidirectional flow into the second-stage fermentation pipeline. The first and the second water guiding pipes are connected to the second-stage inlet/discharging tube at the lowest position of the hydraulic pressure room in horizontal plane. The side surface of the hydraulic pressure room and first-stage fermentation pipeline is connected to a third water guiding pipe. The third water guiding pipe is set with the check valve for controlling one-way flow of the biogas slurry into the first-stage fermentation pipeline.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the vertical tower type multistage circulating linkage high-efficiency fermentation system.