Device for opening and closing skylight

The utility model relates to the field of skylights, in particular to a device for opening and closing a skylight. The device for opening and closing the skylight comprises a pair of oppositely-arranged first steel channels, and the outer wall faces of the two first steel channels are connected with a first connecting frame; the outer wall faces of the two pieces of second channel steel are connected with a second connecting frame, the second channel steel is connected with the groove of the first channel steel in a sliding mode, and the opening direction of the groove of the second channel steel is opposite to the opening direction of the groove of the first channel steel. The limiting assembly is arranged on the first steel channel and/or the second steel channel. The bottom face of the groove of the first steel channel is tightly attached to the second steel channel. The first channel steel and the second channel steel are stable in sliding, do not shake and are not blocked, meanwhile, the two side walls o