The invention discloses an environment-friendly polyurethane binder, which belongs to the technical field of binders. The environment-friendly polyurethane binder comprises the following substances by weight: 320 parts of dimethyl carbonate, 587.5 parts of diethylene glycol phthalic anhydride polymer, 20 parts of polyphthalate polyol ester, 1.63 parts of trimethylolpropane, 65 parts of methylbenzene-2,4-diisocyanate, 1.2 parts of 1,4-butanediol, 1.2 parts of 1,3-butanediol, 1.5 parts of catalyst CAT S102, 0.15 part of antioxidant and 3.02 parts of organic bismuth. The binder, provided by the invention, has the advantages of no organic tin residues, strong curing capacity and high peel strength, and a test result of an international authoritative certification body ITS conforms to the current prohibition, rules and regulations of European Union.