The invention provides a lighting device. The lighting device comprises a lamp holder, a tail seat, a lamp body, a retractable mechanism, a power source, an LED illuminating panel and an optical cover; the lamp holder is mounted at one end of the tail seat, and the other end of the tail seat is fixedly connected to one end of the lamp body through the retractable mechanism; the other end of the lamp body is of an opening structure, and the end face of the opening structure is provided with the optical cover; the power source and the LED illuminating plate are mounted in a cavity formed by thelamp body and the optical cover; a connecting wire of an input end of the power source penetrates through the retractable mechanism and the tail seat to be electrically connected to the lamp holder; an output end of the power source is electrically connected to the LED illuminating panel, wherein the retractable mechanism is used for adjusting the distance between the lamp holder and the lamp body. The distance between the lighting device and a ceiling is adjusted through the retractable mechanism, the lighting device can be embedded into the ceiling more easily and quickly, and meanwhile, perfect integration of the lighting device and a building can also be achieved.