Workpiece clamping device for profile cutting machine

The utility model relates to the technical field of profile cutting machines, and discloses a workpiece clamping device for a profile cutting machine, which comprises a shell, two fixing blocks are fixedly mounted at the top of the shell, a clamping mechanism is arranged in the shell, and a rotating mechanism is arranged in the shell. The clamping assembly is used for clamping a to-be-cut piece in the up-down and front-back directions, so that clamping is stable, the transverse clamping assembly is used for making the left side of an ejector block make contact with the to-be-cut piece, transverse clamping is conducted, the to-be-cut piece is clamped in a three-dimensional mode, when a hollow pipe is cut, the ejector block is sleeved with the clamping assembly, and more convenience is achieved; and a third motor is started to enable a rotating shaft B to rotate, a belt wheel A is driven to rotate, and the belt wheel B drives the to-be-cut piece to rotate under the synchronous action of a belt, so that when oth