Roller sign pen capable of drawing straight line

The utility model relates to a roller sign pen capable of drawing straight lines, which comprises a pen body, a pen point and a refill, the pen body is in threaded connection with the pen point, and the refill is limited in a pen cavity formed by the pen body and the pen point. Symmetrically-distributed linear guide holes are formed in the two sides of the pen body, a sliding block sliding in the length direction of the inner wall of the pen body is arranged in the pen body, a sleeve hole for the refill to penetrate through is formed in the middle of the sliding block, shaft rods in sliding fit with the linear guide holes in the two sides are arranged on the two sides of the sliding block, and the shaft rods on the two sides stretch out of the linear guide holes in the corresponding sides and are connected with rolling wheels in a rear mode. The end of the shaft rod is in threaded connection with a nut to axially limit the roller, two ends of the linear guide hole are respectively provided with a locking notc