The invention discloses an environment-friendly industrial cleaning agent which comprises, by weight, 4-7 parts of fatty alcohol-polyoxyethylene ether A, 10-13 parts of fatty alcohol-polyoxyethylene ether B, 5-7 parts of polyoxyethylene-polypropylene oxide block polymer, 6-9 parts of coconut oil fatty acid diethanol amide, 5-7 parts of fatty alcohol-polyoxyethylene ether sodium sulfate, 3-5 parts of triethanolamine oleic soap, 12-15 parts of sodium gluconate, 11-14 parts of sodium silicate, 5-7 parts of sodium borate, 7-9 parts of sodium molybdate and 17-19 parts of water. The fatty alcohol-polyoxyethylene ether A is a polymer obtained by mixing and addition of fatty alcohol, fatty amine and ethylene oxide, wherein the mass of fatty alcohol is larger than that of fatty amine. The fatty alcohol-polyoxyethylene ether A is fatty alcohol and ethylene oxide. The cleaning agent has the beneficial effects of being low in use concentration, high in cleaning efficiency, long in solution service life and the like and is particularly suitable for cleaning before electroplating of steel, aluminum, aluminum alloy, copper, copper alloy and other base material parts or cleaning between machining processes.