Drilling protection device for water, electricity and heating construction

The utility model relates to the technical field of water, electricity and heating construction, in particular to a drilling protection device for water, electricity and heating construction. The protective device comprises a drilling gun and a protective cover. A spiral trapezoidal groove and a plurality of sliding grooves are formed in the circumferential surface of the drilling gun; a spring is fixedly arranged in the sliding groove, the other end of the spring is fixedly connected with a first sliding block, and the first sliding block is installed in the sliding groove in a sliding mode. Each first sliding block is fixedly connected with the protective cover; a circular ring is rotatably mounted on the protective cover, two second sliding blocks are fixedly arranged on the circular ring, and the two second sliding blocks are slidably arranged in the trapezoidal grooves; a cleaning brush tightly attached to the inner wall of the protective cover is fixedly arranged on the circular ring. And when the drill