The invention discloses a novel clamp assembly for workpiece clamping. The novel clamp assembly comprises a machine body. A clamping groove is formed in the inner top of the machine body. First sliding grooves communicating with each other are formed in the bottom of the clamping groove in bilateral symmetry. A second sliding groove is formed in the top of the outer side of each first sliding groove in a communicating manner. A first guide groove is formed in the bottom of each first sliding groove in a communicating manner. A first sliding block is arranged in each first sliding groove in a sliding manner. A clamping arm stretching into the clamping groove is fixedly arranged at the left end of each first sliding block. A first guide block is fixedly arranged at the bottom of each clamping arm. The first guide blocks and the first guide grooves are in sliding fit connection. A first jacking and pressing spring is fixedly connected between the inner side face of each first guide blockand the inner side wall of the corresponding first guide groove. The novel clamp assembly is simple in structure and convenient to use, workpieces can be automatically clamped, and therefore the workpieces can be machined conveniently.