An electric generator protective cover has a protective cloth cover, a cover assembly, and a plurality of fixing feet. The cover assembly includes a central block located in the center of the top and four elastic supporting rods fixed to the central block. The protective cloth cover is jacked up through the central block and the four elastic supporting rods. One end of each fixing foot is connected to an elastic supporting rod, and the other end is mounted on an upper cross bar of an electric generator frame. The electric generator protective cover has the advantages that the protective cloth cover is arranged, which can isolate dirt such as rain, snow, mud, and sand.