NOVELTY - Waste mycelium is fermented to produce chemical potash fertilizer by fermenting waste mycelium to mix with biogas residue, adding cellulase and hydrolyzing; mixing superphosphate, potassium chloride, monopotassium phosphate and potassium mineral powder to prepare culture medium; cultivating Bacillus circulans and Bacillus mucilaginosus; and producing chemical potash fertilizer by diluting Bacillus circulans seed liquid and Bacillus mucilaginosus seed liquid with sterile water, connecting to solid fermentation culture medium, and fermenting for 2-8 days.    USE - Method for fermenting waste mycelium to produce chemical potash fertilizer (claimed).    ADVANTAGE - The method ferments the waste mycelium, the biogas residue and potassium mineral powder mixture by solid fermentation process. It has low cost and high efficiency, does not harm the environment, optimizes resource utilization, and is suitable for large-scale production.    DETAILED DESCRIPTION - Fermentation of waste mycelium to produce chemical potash fertilizer comprises: (A) pre-processing biogas residue, fermenting the waste mycelium to mix with the biogas residue, adding cellulase and hydrolyzing; (B) preparing solid fermentation culture medium by fermenting waste mycelium and urea by the processed biogas residue together with the cellulase, and mixing superphosphate, potassium chloride, monopotassium phosphate and potassium mineral powder, where the initial water content of the mixture is 60-80% and the pH is 6-8; (C) cultivating Bacillus circulans and Bacillus mucilaginosus, inoculating the germ body cultivated on inclined plane into a shake flask to cultivate the shake flask seed, and inoculating the shake flask seed to a fermentation tank to amplify and cultivate to secondary seed; and (D) producing chemical potash fertilizer by solid fermentation; diluting the Bacillus circulans seed liquid and the Bacillus mucilaginosus seed liquid into 1 billion/ml with sterile water, connecting to solid fermentation culture medium according to ratio, mixing uniformly in the fermentation pool after inoculating and fermenting for 2-8 days, and drying.