The invention discloses environment-friendly type oil for a heavy-duty industrial gear. The oil comprises base oil, an anti-wear reagent at extreme pressure, an antioxidant corrosion-resistant agent, a metal passivator, an antirust agent, a demulsifier, an antifoaming agent, an oiliness agent, and a viscosity index improver. The oil for the heavy-duty industrial gear is good in comprehensive property, not only has good antioxidant and corrosion-resistant properties, antirust property, anti-wear and corrosion-resistant properties, friction reduction, bearing, high torque, high-temperature stability, demulsibility, antifoaming property and the like, and is capable of reducing emission, good in biodegradability, and lower in cost, but also can be used for enabling an industrial gear to form an anti-wear, high temperature-resistant and extrusion-resistant boundary lubricating oil film under the high torque or impact load, so as to ensure that the gear is well lubricated. Additives are selected by adopting an artificial neural network algorithm, the optimal formula can be selected by a genetic algorithm, and the environment-friendly type oil for the heavy-duty industrial gear can meet the performance requirements of the GB5903-1995 heavy-duty industrial gear on the oil with the viscosity grades of 100, 150, 220, 320, 460 and 680.