The invention discloses a compound heat treatment technology for wear-resistant gears. The compound heat treatment technology comprises the following steps: A, washing and drying; B, carburizing; C, carrying out shielding gas air-cooling; D, washing and drying; E, heating and exhausting; F, carrying out intensive carburizing; G, diffusing; H, discharging out of a furnace and air-cooling; and I, carrying out rust prevention. The technology is simple, is environment-friendly and pollution-free in the whole process, can effectively improve the hardness, strength and wear resistance of alloy castings, reduces production cost, saves energy, reduces environmental pollution, is high in tempering temperatures, enables the gears to be resistant to high temperatures, deformation and friction and prolongs the service life.