Water balance flow testing device

The utility model discloses a water balance flow testing device which comprises a pipe shell, a screw joint ring and a water pipe, a metering instrument is installed on the pipe shell, connecting pipes are arranged at the left end and the right end of the pipe shell, inserting pipes are arranged on the surfaces of the connecting pipes, the screw joint ring is connected to the surfaces of the connecting pipes in a screw joint mode, and a plurality of sets of screwing holes are formed in the side face of the screw joint ring. The surface of the connecting pipe is sleeved with an elastic ring, a buckling hole is formed in the surface of the elastic ring, a flange is fixedly connected to the surface of the water pipe, a hook rod is installed on the flange, the other end of the hook rod is connected with the buckling hole in an inserted mode, the inserting pipe is inserted into the water pipe and connected with the water pipe through the inserting pipe, and the hook rod is connected with the flange and the elastic