A direct type backlight unit having liftable frame structure includes a housing, an upper frame and a plurality of lamps, wherein the plurality of lamps disposed on a cavity defined by the housing and at least one has a foggy region. The upper frame is configured to accommodate a plurality of optical films and a liquid crystal panel and has two clip members for engaging with two connection hole of the housing such that the upper frame can be easily fixed on the housing. A plurality of lamp connection units are disposed within the cavity and each includes a conductive clamp member for clamping the conductive electrode of the lamp, thereby facilitating the replacement of the lamps.