Clamp for testing vehicle machine

The utility model discloses a clamp for testing a vehicle machine, which comprises a bottom plate, support frames are fixedly arranged at the left part and the right part of the upper end of the bottom plate, a top plate is fixedly arranged at the upper ends of the two support frames, a telescopic cylinder is fixedly arranged at the upper end of the top plate, and the output end of the telescopic cylinder extends to the lower part of the top plate. A mounting block is fixedly mounted at the output end of the telescopic cylinder, guide rods are arranged at the left part and the right part of the upper end of the mounting block, a testing head is fixedly mounted in the middle of the lower end of the mounting block, two mounting grooves are formed in the upper end of the bottom plate, clamping devices are arranged in the two mounting grooves, and two mounting holes are formed in the middle of the upper end of the bottom plate. And fixing devices are fixedly mounted in the two mounting holes correspondingly, and