The invention relates to a process for manufacturing a cylinder head cover. The process includes the following steps of raw material preparation, mold preheating, paint spraying, core setting and mold assembling, smelting, pouring, cooling, cleaning and polishing, heat treatment, shot blasting and passivating treatment. According to the step of raw material preparation, a certain amount of copper, silicon, magnesium, manganese, nickel, titanium, zinc, chromium, lead, tin, ferrum and aluminum is weighed as required. According to the step of smelting, the raw materials in the first step are put into an electric furnace to be heated and smelted. According to the step of pouring, molten alloy in the fifth step is poured into a mold preheated in the second step. According to the step of cleaning and polishing, the method of sand blasting is adopted for cleaning the surfaces of castings. According to the step of heat treatment, parts obtained in the eighth step are subjected to quenching treatment and aging treatment. According to the step of shot blasting, the parts obtained in the ninth step are subjected to shot blasting. According to the step of passivating treatment, the parts obtained in the tenth step are put into a chromate solution for passivating. The process for manufacturing the cylinder head cover has the advantages of being reasonable in working procedure, capable of saving raw materials and reducing cost, easy to operate, stable in working, high in production efficiency, high in product percent of pass and good in forming quality.