The invention relates to a method for manufacturing a water transfer printing on the surface of a cooker, which is characterized by comprising the following steps: evenly drying the paint coating of the cooker needing transfer printing; putting the cooker in a transfer printing pool, and adding warm clear water to raise the temperature to between 37 and 39 DEG C; then putting a membrane paper on the water surface of the transfer printing pool straightly and evenly, and controlling the fluctuation range of the membrane paper by using a baffle plate; evenly spraying an activating agent on the surface of the membrane paper to dissolve a transparent membrane; transferring the patterns on the membrane paper to the entire outer surface of the cooker by using the extruding force of warm water; then taking a produced tool transferred with the patterns out from the transfer printing pool, and putting the produced tool into a drenching and spraying cleaning machine for cleaning and seasoning; spraying bright protection oil; and drying the tool to obtain the final product. The method has the advantages that: when the membrane paper is placed on the water surface of the transfer printing poolstraightly and evenly, the baffle plate controls the fluctuation range of the membrane paper and the position of the patterns is easy to control so that the patterns can be transferred to the cooker more accurately; besides, the method adopts heating to dry the paint coating and the protection oil so that the production process of the product is effectively accelerated.