Uniform distribution loading device for truss bridge structure test

The invention provides a uniform distribution loading device for a truss bridge structure test, and belongs to the technical field of test devices. The device comprises a water passing clamping groove which is provided with a clamping groove water passing opening; the water passing buckle is provided with a button groove and a buckle water passing opening, and the water passing buckle is clamped in the water passing clamping groove; the water flow switch is provided with a switch water passing opening, is clamped in the water passing buckle and can rotate in the circumferential direction of the button groove; one end of the U-shaped pipe is provided with a U-shaped pipe water passing opening communicated with the clamping groove water passing opening, and the other end of the U-shaped pipe is used for receiving water in waterproof cloth arranged on the truss bridge structure; the fixing buckle is connected with the water passing clamping groove; the clamping groove water passing opening is communicated with t