NOVELTY - Circulation processing of cow dung using earthworm composting pool comprises constructing composting pool with circulation patterns of earthworm compost pool; mixing fresh cow dung manure and composting manure, then adjusting the carbon and nitrogen feed ratio to 30:1; detecting carbon and nitrogen ratio in the mixed feed; stacking mixed feed in the composting pool; inoculating earthworms; carrying out fermentation for 30 days/cycle, screening the composting manure and processing to extract earthworms, and drying the decomposed cow dung.    USE - The method is useful for circulation processing of cow dung using earthworm composting pool (claimed).    DETAILED DESCRIPTION - Circulation processing of cow dung using earthworm composting pool comprises constructing composting pool with circulation patterns of earthworm compost pool, which is also known as circulation biological treatment bed, having width of 3.5 m, rectangular plots with length of 30 m, excavating a gutter with 50 cm deep and 40 cm wide; covering the plot with 2-3 cm gravel layer as a prop, and having 7-8 cm thickness, packing graves, covering with a layer of nylon mesh, so as to prevent excessive inflow of cow dung and escape of earthworms, compacting land level, so as to form earthworm composting pool base surface, where in the hot summer season, at greater than or equal to 30 degrees C, providing a shade net at 2.5 m height of tank top; in low temperature winter, covering the pool with a plastic sheet at less than or equal to 5 degrees C, so as to maintain the compost temperature at 10-30 degrees C, mixing 2000 kg fresh cow dung manure and 3000 kg two months naturally composted composting manure in the weight ratio of 2:3, mixing the mixed cow dung with 952 kg corn stalks in the weight ratio of 5.6:1, then adjusting the carbon and nitrogen feed ratio to 30:1, where the total weight of mixed food is 5952 kg, for 1 compost pool; detecting carbon and nitrogen ratio in the mixed feed, if the carbon source is less, then adding corn stalks powder, if the nitrogen content is low, then adding urea as a nitrogen source, adjusting the moisture content of the mixed feed to 70%; stacking mixed feed in the composting pool; inoculating earthworms; controlling the earthworm composting tank temperature at 22 plus minus 4 degrees C, humidity at 70%, and carrying out fermentation for 30 days/cycle, screening the composting manure and processing to extract earthworms, drying the decomposed cow dung and using as earthworm manure or organic fertilizer for farmland.