The utility model relates to an air filling shower cover of household water heater, composed of an upper cover, an internal sleeve, a plunger chip, a plastic film cover, an air filling plastic hose, a bottom cover and trapezoid screw caps, wherein, the upper cover and the internal sleeve are matched and combined and made up into a top cover which is connected with the plastic film cover; the plunger chip is installed in the middle part of the top cover; the air filling plastic hose is installed on the low part of the plastic film cover. The utility model can be matched with the water heater conveniently for use, solves the difficulty of the water heater that the shower can not be carried out because of the air temperature is low and the water output is small, and the has the advantages of reasonable structure, convenient operation, easy disassembly and assembly and convenience for storage.