The utility model provides a multi -thread laser radar based on motor overhead, multi -thread laser radar includes laser instrument, photoelectric sensor and scanning device, scanning device includes: the axis, the motor, the stator cover of motor is in the outer fringe on centraxonial top, the rotor of motor winds the well rotation of axes, rotate the chamber, including a motor, an end cap, a controller, and a cover plate, the centraxonial outer fringe of stator lower part, the rotor is connected and the drive rotate the chamber around the well rotation of axes, the bottom and the distance between the base of rotating the chamber are greater than zero, laser instrument and photoelectric sensor set up the intracavity rotates, the base, centraxonial bottom mounting is in on the base. The utility model has the advantages of small, stable good, maintenance convenience.