The invention discloses low-pour-point gear oil. The low-pour point gear oil comprises the following substances in parts by weight: 85-91 parts of polyethylene glycol ether, 0.6-2 parts of an aromaticamine antioxidant, 1-1.5 parts of a viscosity index improver, 1.5-2.5 parts of an ashless composite extreme-pressure anti-wear agent, 1.0-1.5 parts of a repair type friction improver, 0.8-1.2 parts of an anti-emulsifying agent and 1.2-1.5 parts of an anti-rust anti-corrosion agent. The preparation method of the low-pour-point gear oil comprises the following steps: (1) adding base oil, namely polyethylene glycol ether, into a blending kettle, and increasing the temperature to 50-55 DEG C; and (2) sequentially adding the aromatic amine antioxidant, the viscosity index improver, the ashless composite extreme-pressure anti-wear agent, the repair type friction improver, the anti-emulsifying agent and the anti-rust anti-corrosion agent according to the ratio, and then carrying out stirring for40-60 minutes until the mixture is uniform. According to the low-pour-point gear oil provided by the invention, the low-temperature fluidity, oxidation stability and excellent anti-wear protection performance of gear oil can be greatly improved; and the low-pour-point gear oil has a relatively low friction coefficient and traction coefficient, is high in viscosity index and low in pour point, hasno wax structure, and has excellent corrosion resistance and rust resistance.