Skylight mounting clamp

The utility model discloses a skylight installation clamp which comprises an installation base plate, a floating mechanism pushing air cylinder, a frame connection combination and a floating mechanism combination. A floating mechanism pushing air cylinder with the moving direction perpendicular to the mounting base plate is mounted on the mounting base plate, the floating mechanism pushing air cylinder is connected with the floating mechanism combination through a transmission mechanism, the frame connection combination comprises a plurality of square frames which are connected with one another, and clamping fixing structures matched with the skylight are arranged on the square frames. The floating mechanism combination comprises an I-shaped piece, an upper middle piece and two upper side pieces arranged on the two sides of the upper middle piece, a second connecting piece is arranged on the upper middle piece, the upper middle piece is connected with the two upper side pieces through Y-direction springs, and