Clamp for clamping three-way part

The utility model relates to the field of clamps, in particular to a clamp for clamping a three-way part, and aims to solve the technical problems that four-claw clamping machining is adopted in the prior art, clamping is time-consuming, and a machining plane is slow to align. A first sliding block, a second sliding block and a third sliding block are connected into three sliding grooves of the cross-shaped sliding groove in a sliding mode, the first sliding block, the second sliding block and the third sliding block can be self-locked, no sliding block is arranged in the other sliding groove of the cross-shaped sliding groove, the three-way piece is arranged in the cross-shaped sliding groove in an inverted-T shape and clamped by the third sliding block, and the first sliding block and the second sliding block are clamped on the two side faces of the three-way piece. The three axially-adjustable sliding blocks are arranged in the cross-shaped sliding groove of the clamp, one end face of the three axially-adj