The invention discloses a terminal device for a computer. The terminal device comprises a host body and a USB memory disk plugged with and connected with the host body. A rotating cavity is arranged in the left end surface of the host body; a rotating arm is installed in the rotating cavity cooperatively by a first rotating shaft; an elastic reset mechanism for pulling the rotating arm is arrangedin the inner top wall of the rotating cavity; a pulling mechanism for pulling the rotating arm is arranged in the right inner wall of the rotating cavity; and a locking rack is fixedly arranged at the left end surface of the rotating arm. A concave cavity for rotation and accommodation of the locking rack is communicated to the upper side wall of the rotating cavity in the left end surface of thehost body; an accommodation cavity for complete rotation and accommodation of the locking rack is communicated to the lower side wall of the rotating cavity in the left end surface of the host body;a protruding part is fixedly arranged at the bottom of the left end surface of the locking rack; and an insertion slot is formed in the left end surface of the locking rack at the upper side of the protruding part.