The invention discloses a clamping device which comprises a base plate, baffles and cushion blocks. The clamping device is characterized in that the baffles are vertically arranged on the base plate in parallel and have the L-shaped cross sections. The cushion blocks which are arranged in parallel and bolt bars which are correspondingly arranged are arranged on the inner sides of the baffles. A test piece is arranged between the parallel cushion blocks and adheres to the cushion blocks. The clamping device is suitable for angle-form member part test pieces with different materials and different section specifications and can adjust the opposite positions of a test piece centroid and a loading end according to the centering situation of an axle load test in a fine mode.