1. A lighting device, comprising:a cover comprising a top wall and a side wall extending downwards from the top wall, and a receiving chamber defined by the top wall and the side wall;
an insulation component located on an inner surface of the side wall of the cover and defining a receiving groove;
a light source assembly located on a surface of an inner wall of the receiving groove of the insulation component;
a light guide assembly received in the receiving chamber of the cover, wherein the light guide assembly comprises an end received in the receiving groove of the insulation component;
a metal frame fixed at a periphery of the cover; and
a driving power supply assembly disposed on an upper surface of the cover, wherein the driving power supply assembly is attached onto the upper surface of the cover and is electrically connected with the light source assembly to supply power to the light source assembly.