Underground water pipe

The utility model belongs to the field of building materials, and particularly relates to an underground water pipe which comprises a pipe body. The fixing devices comprise two clamping assemblies, each clamping assembly comprises an outer shell, an inner shell and an elastic part, the inner shells are arranged in the outer shells, the elastic parts are connected between the inner shells and the outer shells, and the outer shells of the two fixing devices are detachably connected; and the insertion rod is detachably mounted on the fixing device. The two clamping assemblies are clamped on the two sides of the pipe body, the inner shells of the two clamping assemblies are buckled on the two sides of the pipe body correspondingly, then the outer shells of the two clamping assemblies are connected, and therefore the fixing device is installed on the pipe body, the inserting rod is inserted into the ground, and the pipe body is fixed through the inserting rod; in addition, when pipe bodies with other pipe diameter