Steel structural part machining lifting clamp for crane

The utility model relates to the technical field of lifting clamps, in particular to a lifting clamp for machining a steel structural part for a crane, which is characterized in that a through hole is formed in the surface of a bracket connecting column, a positive and negative tooth screw rod is inserted into an insertion hole, and one end of the positive and negative tooth screw rod is connected with a driving motor for driving the positive and negative tooth screw rod to rotate; a clamping supporting part transversely moving along the outer wall of the support connecting column sleeves the positive and negative tooth lead screw in a meshed mode, a synchronous connecting mechanism connected with the clamping jaw connecting disc is arranged above the auxiliary clamping jaw, and a quick-release connecting mechanism connected with the auxiliary clamping jaw is arranged on one side of the clamping supporting part. The auxiliary clamping jaw can be quickly mounted on one side of the supporting clamping jaw throu