A connection unit for fluorescent tubes includes a base connected to each of two ends of a light unit and the base has an extension, two conductive plates are connected to two reception areas of the extension, a cover is removably connected to the base and has a room and a recessed area is defined in the top of the cover, a rotatable member is removably connected to the recessed area and has a face board which has a reception hole communicating with the room, a shank is connected to the periphery of the reception hole and the rotatable member is rotatable about an axis of the recessed area, the base and the conductive plates are pulled out from the recessed area and the room respectively.