The invention discloses a laser emitting device, which comprises a laser emitter, wherein the emitting port of the laser emitter is provided with a conical emitting mirror. The laser emitting device further comprises a rotating disc arranged in a mode of being coaxial with the conical emitting mirror, wherein the rotating disc is provided with a plurality of radially arranged tube cavities, and the outer side of each tube cavity is provided with an optical lens capable of turning a laser beam into a laser plane. According to the laser emitting device, the laser emitter emits a beam, the laserbeam is reflected by the conical emitting mirror and forms multiple parallel laser beams, part of the laser beams pass through the tube cavities on the rotating disc, and the laser beam is turned intoa laser plane through the optical lens outside each tube cavity. The laser emitter is fixed, and the rotating disc rotates, so that the laser plane is enabled to have a rotating effect. Therefore, multiple laser planes can be emitted by adopting one laser emitter. In addition, the laser emitting device is simple in overall structure and applied to the field of laser equipment.