The invention discloses a reinforcing-steel-bar shearing resistance testing clamp. The reinforcing-steel-bar shearing resistance testing clamp comprises a clamping block and two reinforcing-steel-bar fixing blocks located at the bottom of the clamping block. A strip-shaped slot is formed in the bottom face of the clamping block in the horizontal straight line direction. Clamping blocks in sliding fit with the strip-shaped slot are arranged at the top faces of the two reinforcing-steel-bar fixing blocks respectively, so that the two reinforcing-steel-bar fixing blocks can oppositely move in the length direction of the strip-shaped slot. Positioning devices capable of positioning the reinforcing-steel-bar fixing blocks are arranged on the clamping blocks. Through holes are coaxially formed in the two reinforcing-steel-bar fixing blocks in the length direction of the strip-shaped slot respectively. The reinforcing-steel-bar shearing resistance testing clamp is simple in structure and convenient to operate, shearing resistance testing can be carried out on reinforcing steel bars in different diameter specifications, the test investment cost is reduced, and the test efficiency is improved.