The present invention relates to an easily-maintainable lamp connection device. The device comprises a lamp body, a front head arranged at the opening end of the lamp body, and a moveable link rod provided between the lamp body and the front head, which is able to slide freely; a stationary ring positioned firmly at the opening end of the lamp body with having a gap between said stationary ring and the inside wall of the lamp body; the rod body of moveable link rod is arranged with going through said gap, after assembling, the upper end of the moveable link rod located inside of lamp body has a stopper whose size is bigger than that of said gap, and the lower end of moveable link rod located inside of front head is hinge jointed with the hinge mechanism inside of the front head.