The invention discloses a novel environment-friendly easy-to-degrade dye penetrant including, by weight, 10-14 parts of fatty alcohol succinic acid ester, 3-6 parts of epoxy chloropropane, 3-6 parts of dodecyl dihydroxyethyl betaine, 15-20 parts of vinyl acetate, 11-14 parts of dimethyltin bis(2-ethylhexylmercaptoacetate), 40-48 parts of deionized water, 3-10 parts of sodium dodecyl benzene sulfonate, 2-6 parts of sodium diethylhexyl sulfosuccinate, 12-16 parts of sucrose ester, 4-12 parts of diethylaminoethyl methacrylate, and 4-8 parts of acrylic acid. The environment-friendly easy-to-degrade dye penetrant has excellent homogenous dyeing performance, significantly increases absorption rate of a dye, is safe, harmless, green and environment and also has excellent biodegradability. The required raw materials of the dye penetrant are low in cost and easy to obtain, so that the dye penetrant is easy to prepare and is low in demand on production equipment.