The invention discloses a microorganism chelating agent for producing bio-organic fertilizer by removing organic solid waste heavy metal, wherein the microorganism chelating agent comprises a culture medium and a fermenting chelating bacteria in weight ratio of 1:9, the culture medium comprises the following materials in parts by weight: 60 parts of turf, 10 parts of activated carbon, 10 parts of sugar mud, 5 parts of rapeseed meal and 5 parts of wheat bran; the fermenting chelating bacteria comprises the following raw materials in parts by weight: 0.5 part of aspergillus niger, 0.5 part of white-rot fungi, 1 part of cyanobacteria, 1.5 part of candida pseudotropical, 1.5 part of lactic acid bacteria, 0.5 part of acidithiobacillus ferrooxidans, 0.5 part of streptomycete, 1.5 part of cellulose, 1.5 part of glucoamylase and 1 part of non-ionic surfactant. The microorganism chelating agent is capable of removing the heavy metal ion in the organic solid waste so as to sufficiently utilize the organic waste resource, the waste is avoided, the pollution is prevented, and the environment friendliness is achieved.