Mechanical performance test fixture for composite material

The invention relates to a fixture mechanism, in particular to a mechanical performance test fixture for a composite material. The mechanical performance test fixture comprises a test piece, bolts, horizontal clamp plates and a mounting hole, and is characterized by further comprising vertical baffles and stop screws, wherein the vertical baffles are mounted on two sides between the two horizontal clamp plates arranged up and down; blind holes are formed in one side of each vertical baffle, and the other side of each vertical baffle is in contact with the test piece; a lower clamp plate of each horizontal clamp plate adopts a U-shaped structure, and threaded holes are formed in two side surfaces of the horizontal clamp plates; the stop screws pass through the threaded holes of the horizontal clamp plates of which the lower clamp plates are of U-shaped structures; and the other ends of the stop screws are in contact with the interiors of the blind holes in the vertical baffles. According to the mechanical perf