Self-positioning sleeve device

A self-positioning sleeve device relates to the technical field of constructional engineering and comprises a laser emitting unit and a sleeve positioning unit, the laser emitting unit comprises a laser emitter capable of emitting a cross-shaped laser beam, the sleeve positioning unit comprises a sleeve and a positioning cover buckled at the top end of the sleeve, and the positioning cover is arranged on the sleeve. The positioning cover is coaxial with the sleeve, the lower surface of the positioning cover is perpendicular to the axis of the sleeve, a through laser penetrating hole is formed in the center of the positioning cover, a cross-shaped groove is further formed in the lower surface, with the laser penetrating hole as the center, of the positioning cover, and laser fluorescent powder is arranged in the cross-shaped groove. And the laser transmitter is matched with the positioning cover for use. The perpendicularity of the vertical sleeve can be effectively guaranteed, the construction quality is impr