The enamel sintering deformation of enamel liner for air energy water heater occurs during the manufacturing process, which causes the problem for stagger edge of barrel and head assembly and affects the welding of the subsequent process. Therefore, the various processes of enamel liner head processing was checked one by one by the elimination method, and the strength performance of steel at different high temperatures was measured by thermal simulation testing machine Gleeble 3500 to establish the calculation formula of the deformation for steel plate caused by the moment of the dead weight for steel plate at high temperature. The test verification was carried out. The enamel sintering process was the key process for the deformation of enamel liner head for air energy water heater. Furthermore, the structure change + high-temperature phase change + high-temperature creep, etc. occured during the sintering and heating process of head, and the superposition of these factors was the main cause for the deformation amount of head to exceed 2.0 mm. Finally, the improvement measure of increasing the number of fulcrums for head enamel sintering support was proposed. According to industrial production verification, the fluctuation range of the enamel sintering deformation for head could be controlled to be less than 2.0 mm in the horizontal gap.