The present invention provides an integrated lighting apparatus including a main frame constructed by at least a first frame wall, a second frame wall adjacent to the first frame wall and a third frame wall adjacent to the second frame wall and opposite to the first frame wall. The first, second and third frame walls define an interior space for receiving a lighting device therein. The main frame is integrated with a heat-dissipating portion extending from a first side of the first frame wall. The interior space is covered with the lampshade. Through the heat-dissipating portion, the lighting apparatus is detachably combined with the refrigerated display cabinet in a simple and convenient manner.