The invention discloses an examination paper binding machine. The examination paper binding machine comprises a main box. A supporting body is arranged on the left side of the main box, and a first sliding groove is formed in the end face of the left side of the main box in a rightward extending mode. A cross beam is arranged in the first sliding groove in a left-right extending mode, and a crankcavity is formed in the bottom wall of the first sliding groove in a downward extending mode. A first sliding cavity is formed in the bottom wall of the crank cavity in a downward extending mode. A second sliding groove is formed in the position, on the left side of the first sliding cavity, in the main box in a downward extending mode. A gear cavity is formed between the first sliding cavity anda second sliding cavity in a communicating mode. Binding devices are arranged in the first sliding cavity and the second sliding cavity. A first cavity is formed in the position, on the right side ofthe crank cavity, in the main box, and a second cavity is formed in the position, on the right side of the first cavity, in the main box. A third cavity is formed in the position, at the bottom of thesecond cavity, in the main box. A power rotary shaft which is arranged in a left-right extending mode is connected between the second cavity and the first cavity in a rotating-fit mode.