The invention provides an assembly structure of an upper framework of an automobile skylight. The assembly structure comprises a worktable, wherein the worktable is fixedly provided with two inverted U-shaped brackets with the same size through bolts, a pneumatic push rod is fixedly arranged between the two inverted U-shaped brackets through bolts, and is connected with an air inlet pipe, the bottom part of the pneumatic push rod is provided with an L-shaped end surface, the worktable is provided with a circular fixing disc corresponding to the L-shaped end surface, the upper part of the circular fixing disc is provided with a cylindrical press seat, and the upper end surface of the cylindrical press seat is provided with an L-shaped groove which is matched with the L-shaped end surface. The assembly structure has the advantages that by arranging the L-shaped end surface of the pneumatic push rod, the framework part of the automobile skylight is directly arranged on the cylindrical press seat by the matching of the L-shaped groove and rectangular rubber cushions, and the required angle is pressed when the pneumatic push rod is pressed; different pressing seats and push rods can be replaced according to different requirements, so the function of quick pressing is realized, the production efficiency is further improved, and workpieces can be quickly processed.