The invention discloses a leftover material processing device. The leftover material processing device comprises a working table, a set of sliding ways is formed in the upper surface of the working table, a sliding rail number one is arranged in each sliding way, an electric trolley number one is arranged on each sliding rail number one, a miniature air cylinder with the telescopic end in the horizontal direction is arranged on each electric trolley number one, the telescopic end of each miniature air cylinder is provided with an installing box, and a rotating motor with the rotating end in the horizontal direction is arranged in each installing box; a controller is arranged on one side face of the working table, a mains supply interface is formed below the controller and electrically connected with the controller, and the controller is electrically connected with the electric trolleys number one, the rotating motors, the telescopic air cylinders and miniature linear motors. The leftover material processing device has the advantages of being easy to operate, convenient to use, neat in cutting and suitable for small and medium-sized enterprises and practical, liberates manpower and protects body safety of operators.