Clamp of pipe hydrostatic testing machine

The utility model belongs to the field of pipe performance detection equipment, particularly relates to a clamp of a pipe hydrostatic testing machine, and aims to solve the problems that an existing pipe is difficult to fix in the clamp when being put in and cannot be placed, and the following scheme is provided: the clamp comprises a clamp body, one side of the clamp body is provided with a fixed base in a clamping manner, and the fixed base is provided with a clamping groove; two sliding grooves are formed in the top of the fixed base, a plurality of sliding metal blocks are slidably installed in the two sliding grooves, corresponding movable metal blocks are fixedly installed at the tops of the multiple sliding metal blocks, and containing grooves are formed in one sides of the multiple movable metal blocks; fixing mechanisms are arranged in the multiple containing grooves correspondingly, multiple buffer springs are fixedly installed on the inner wall of the clamp body, and the same pressure plate is fixe