The invention discloses a lamp with an assembling and disassembling function, which includes a lamp tube, wherein a fixing element for mounting with an equipment guide rail is arranged on the lamp tube, and the fixing element includes a mounting sliding chute, which is adapted to the equipment guide rail, so that the mounting sliding chute can slide into the equipment guide rail; a locking element, which is arranged in the mounting sliding chute and is pressed against and matched with a groove of the equipment guide rail to fix the lamp tube on the equipment guide rail; and an operating element, an outer contour of the operating element being exposed from an outer contour of the lamp tube, an interior of the operating element being connected with the locking element, the rotating element being rotated to drive the locking element to lock and unlock equipment.