The utility model relates to the technical field of lighting devices, and discloses an adjustable lighting device which comprises a fixing box, an installation frame and a protective cover, a lifting mechanism is fixedly installed at the top of the fixing box, a supporting top plate used for fixing is fixedly installed at the other end of the lifting mechanism, and a fixing rod used for supporting is fixedly installed on the surface of the supporting top plate. The other end of the fixing rod is connected with an air pressure rod for pushing through a connecting shaft, the other end of the air pressure rod is connected with a fixing frame for mounting through a connecting shaft, a mounting groove for fixing is formed in the bottom of the mounting frame, and an illuminating lamp for illuminating is fixedly mounted on the inner wall of the mounting groove. According to the adjustable lighting device, through the arrangement of the air pressure rod, the mounting frame can be driven to move up and down under the cooperation of the connecting shaft along with the extension or shortening of the air pressure rod, then the lighting lamp can be conveniently driven to be adjusted up and down, and therefore the purpose of adjusting the lighting angle can be achieved.