Drain pipe

The utility model relates to the field of drainage, in particular to a drainage pipe which comprises a drainage pipe body and is characterized in that a protective cover is arranged on the outer side of the drainage pipe body, silica gel cotton is filled in the inner side wall of the protective cover, and a heat preservation rock wool net is laid on the side, away from the protective cover, of the silica gel cotton. One side, far away from the silica gel cotton, of the heat preservation rock wool net adheres to the outer side wall of the water drainage pipe, the water drainage pipe is connected with the protective cover through the heat preservation rock wool net on one side of the silica gel cotton, and the problems that in the using process of an existing water drainage pipe, due to the fact that the water drainage pipe is exposed outside for a long time, heat is easily absorbed, and the service life of the water drainage pipe is prolonged can be solved. The drainage pipe is frozen due to the fact that the