Abstract: The present invention relates to the connecting structure between lamp rack and switch box, and more particularly to a connecting structure that can be easily and precisely positioned, wherein the surrounding wall of the switch box includes several slots and the slot allows the square joint of the lamp rack to set in, while the top cover is pressed down onto the square joint and locked by the use of a stud or a bolt. In addition, the slots can be formed on the bottom of the switch box and the bending tube of the lamp rack can be inserted into the cutoff of the reinforce plate, so the square joint of the lamp rack can be inserted into the slot and the top cover and the reinforce plate are locked by a stud or a bolt.