NOVELTY - Biogas generator comprises pre-treatment device (1), hardening and tempering heating pool (2), the first extrusion solid-liquid separating machine (4), hydro-thermal reactor (5), high temperature dry fermentation chamber (9), second extrusion solid-liquid separation machine (10), dryer (16), anaerobic digestion pool (3), marsh gas purifier (11), marsh gas power generation unit (12) and first heat exchange device. The first heat exchange device is set on cooling device and the hardening and tempering heating pool.    USE - Biogas generator coupled with heat utilization system for performing anaerobic fermentation of fruit and vegetable refuse (claimed).    ADVANTAGE - The biogas generator is coupled with heat utilization system that increases fruit and vegetable waste comprehensive energy and resource efficiency.    DETAILED DESCRIPTION - Biogas generator comprises pre-treatment device (1), hardening and tempering heating pool (2), the first extrusion solid-liquid separating machine (4), hydro-thermal reactor (5), high temperature dry fermentation chamber (9), second extrusion solid-liquid separation machine (10), dryer (16), anaerobic digestion pool (3), marsh gas purifier (11), marsh gas power generation unit (12) and first heat exchange device. The first heat exchange device is set on cooling device and the hardening and tempering heating pool. The first extrusion solid-liquid separating machine, second solid-liquid separation extrusion machine and anaerobic digestion pool are connected. An INDEPENDENT CLAIM is included for a method for performing anaerobic fermentation of fruit and vegetable refuse, which involves:    (A) sorting fruits and vegetables through pretreatment device;    (B) cleaning, quenching and preheating;    (C) separating liquid using first extrusion machine;    (D) disposing the solid residue in the high temperature hydrothermal reactor for hydrolysis;    (E) performing anaerobic fermentation and separating liquid using second extrusion machine to obtain residue and debris; and    (F) drying to obtain a solid organic fertilizer residue and recovering heat through first heat exchanger and second heat exchanger.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of biogas generator. (Drawing includes non-English language text).    Pre-treatment device (1)    Heating pool (2)    Anaerobic digestion pool (3)    First extrusion solid-liquid separating machine (4)    Hydro-thermal reactor (5)    Dry fermentation chamber (9)    Second extrusion solid-liquid separation machine (10)    Marsh gas purifier (11)    Marsh gas power generation unit (12)    Dryer (16)