The present invention discloses a light-emitting device of a liquid crystal display apparatus, which includes a light bar and a frame. The frame has a surface having a fixing bar protruded therefrom. An extension direction of the fixing bar is parallel with the surface of the frame. A longer side of a main body of the light bar is attached to the fixing bar. Two ends of the fixing bar respectively have a heat-conductive portion mounted thereon. An inner surface of the heat-conductive portion is perpendicular to a length direction of the main body of the light bar and attached to a shorter side of the main body of the light bar. The present invention further discloses a liquid crystal display apparatus.