A lighting device comprises a holding base, light source arranged on the holding base and driving power supplying power for the light source. The holding base is equipped with a face plate and at least a backing plate between which a holding space is formed. An opening is arranged on the face plate corresponding to the holding space, and a lug boss extending to the upward side of the holding space is included in the face plate. A grooving communicated with the holding space is arranged on the side of the holding space on the backing plate. The power is positioned fixedly in the holding space via the grooving, a buckle slab arranged on the backing plate and the lug boss of the face plate. In the invention, the assembly and disassembly of the power can be finished only by bending or straightening the buckle slab, thus the assembly, disassembly and replacement of the power are more convenient.