Surface forming laser 3D printing device

The utility model provides a surface forming laser 3D printing device, and belongs to the technical field of photocuring additive manufacturing. The laser 3D printing device comprises a laser, a zoom beam expander group, a reflector, a beam shaping device, a working surface and an industrial personal computer, the laser is connected with the zoom beam expanding lens group through a mechanical connecting piece, the reflecting mirror is placed between the zoom beam expanding lens group and the light beam shaping device, and the light beam shaping device irradiates a shaped light beam on a working surface; the industrial personal computer is in signal connection with the zoom beam expanding lens group and the beam shaping device; the light beam shaping device comprises a cylinder with a polygonal bottom surface, a mechanical shaft is sleeved in the cylinder, a fan blade is hinged outside the cylinder, and the fan blade is provided with a through hole for the optical axis to pass through; according to the optical