Protective cover plate for buried fire sprinkler

The protective cover plate comprises a fixed seat, a sliding groove is formed in the top of the fixed seat, a sliding plate is installed in the sliding groove in a sliding mode, a strip-shaped first installation groove is formed in the bottom of the sliding plate, a first rack is fixed in the first installation groove, a groove is formed in the top of the fixed seat, and a second rack is fixed in the groove. A strip-shaped second mounting groove is formed in the bottom of the interior of the groove, a second rack is fixed in the second mounting groove, a guide rod slidably penetrates through the side edge of the groove, a gear is rotatably mounted at one end of the guide rod, and the gear is in meshing transmission with the first rack and the second rack; and a roller is rotationally mounted at the other end of the guide rod. The underground hidden sprayer can be protected, meanwhile, the sprayer can be quickly moved away when working, the sprayer can be automatically reset after working is completed, and the