The invention discloses an industrial wastewater high-efficiency treating agent and a preparation method thereof. The industrial wastewater high-efficiency treating agent is prepared from 28 parts of activated sludge, 20 parts of activated carbon, 22 parts of polyaluminum chloride, 11 parts of aluminum sulfate, 6 parts of cationic polyacrylamide, 7 parts of ferric sulfate chloride, 16 parts of pectinase, 5 parts of copper sulfate chloride, 13 parts of oxalic acid, 5 parts of polyaluminum silicate sulfate, 7 parts of citric acid, 1 part of ethylenediaminetetramethylene phosphonic acid, 6 parts of tetrabutylammonium bromide, 2 parts of ethylene glycol monobutyl ether, 4 parts of calcium fluoride, 1 part of ammonium molybdate, 10-16 parts of ethanediol, 11-13 parts of quaternary ammonium salt lignin flocculant, 6-8 parts of butyltetra titanate, 3-5 parts of nonylphenol polyethenoxy ether, 25-45 parts of microbial solution and the like. The industrial wastewater high-efficiency treating agent has the characteristics of reasonable formula, simple preparation method, accessible raw materials, low cost and high purification speed, greatly enhances the industrial wastewater treatment effect, and has dvantages of no toxicity, no harm and favorable sewage treatment effect.