Water stop effect test device for water stop curtain of deep foundation pit

The invention discloses a water stop effect test device for a deep foundation pit water stop curtain, which comprises a test box, two symmetrically arranged mounting blocks are fixedly connected to the test box, the cross section of each mounting block is U-shaped, a water stop sheet is arranged between the two mounting blocks, and the water stop sheet is fixedly connected to the test box. One side of the test box is fixedly connected with a plurality of water inlet pipes, and one side of each water inlet pipe is provided with a water pumping machine; each mounting block is slidably connected with two sliding blocks, each sliding block is provided with a plurality of limiting grooves, the cross sections of the limiting grooves are in a right trapezoid shape, and the mounting blocks are provided with a plurality of limiting assemblies. According to the method, a large number of water pumping holes and observation holes do not need to be formed, a large number of manpower and material resources do not need to b