Laser positioner applied to reserved casing pipe

The utility model provides a laser positioner applied to a reserved sleeve, which relates to the technical field of foundation construction and comprises an inner diameter die, the upper end face of the inner diameter die is sunken downwards to form an inner sleeve, the inner sleeve is provided with a bearing clamping seat, and a centripetal self-lubricating joint bearing is arranged on the bearing clamping seat. The centripetal self-lubricating knuckle bearing is in threaded connection with a laser pen fixing cylinder used for installing a laser pen, the inner ring is further connected with a gravity line pendant, the gravity line pendant is located in the inner sleeve, and the weight of the gravity line pendant is larger than the weight of the laser pen fixing cylinder and the weight of the laser pen so as to drive the laser pen fixing cylinder to do pendulum bob motion around the centripetal self-lubricating knuckle bearing. During construction, the inner diameter mold is fixed in the lower floor penetrati