The invention discloses an industrial sewage treatment agent and relates to the technical field of sewage treatment. The industrial sewage treatment agent is composed of the following raw materials in parts by weight: 3 parts of allyl polyoxyalkyl epoxy ether, 5 parts of etherified starch, 3 parts of fatty alcohol-polyoxyethylene ether, 5 parts of polypropylene oxideglycol, 25 parts of a compound synergist, 35 parts of ferric chloride, 25 parts of sodium lignin sulfonate, 18 parts of polyaluminum chloride, 8 parts of diacetone-acryloamide, 5 parts of polyoxyethylene alkylamine, 3 parts of polyacrylamide, 45 parts of a polyaspartic acid granular mixture, 9 parts of zinc oxide, 20 parts of sodium acetate, 13 parts of talc powder, 6 parts of Chinese yam, 8 parts of polysaccharide, 8 parts of sulfuric acid, 3 parts of nanoscale aluminum oxide, 6 parts of compound microorganisms, 55 parts of activated sludge of a sewage plant, 12 parts of volcano wastes and 8 parts of coal cinder. By matching various raw materials to exert a synergistic effect, sewage can be discharged by reaching the standard.