The invention discloses a composite coating thermal spraying method. The method comprises the following steps that oil dirt removing treatment is carried out; sand blasting treatment is carried out; thermal spraying forming is carried out on a composite coating by adopting a liquid fuel-oxygen supersonic speed flame spraying system, technological parameters in the spraying process comprise that the oxygen flow rate is 60000L/h, the kerosene flow is 25L/h, the spraying gun distance is 400 mm, and the powder feeding air flow amount is 15L/min. According to the composite coating thermal spraying method, spraying can be carried out to obtain the composite coating which can further improve the fracture toughness and the wear-resisting performance of a tungsten carbide coating. Solid lubricant MoS2 can be added into tungsten carbide, a self-lubrication composite material can be formed, the tungsten carbide coating has the high wear-resisting performance under the condition of low friction coefficient, and operating can be achieved at high speed, under heavy load and in various active mediums.