The utility model provides a three dimensional printing's laser module detachable construction, includes a platform, one holds a carrier seat and a laser module, and the platform has a working face, and is equipped with a displacement mechanism on the platform, and the displacement mechanism has a displacement bar at least, holds carrier seat and locates on the displacement bar to drive by the displacement mechanism and hold carrier seat and move on the working face along the displacement bar, and hold carrier seat and have an equipment portion, and on the laser module locates equipment portion, and combine together as an organic wholely in order can dismantle the mode with equipment portion. Supply laser module group to establish by holding carrier seat to reach the mesh that can make things convenient for, dismantle the laser module fast.