The embodiment of the utility model provides a mounting seat. At least one long hole group is arranged on a main plate, and the short side size of a rectangle where the long holes in the long hole group are positioned is (L1+L3)/2, and the long side size of the rectangle is (L2+L4)/2, wherein L1 and L3 are center distances of the mounting holes of the short sides of two workpieces to be mounted, L1 is less than L3, L2 and L4 are center distances of the mounting holes of the long sides of two workpieces to be mounted, L2 is more than L4, the long axes of the long holes and the long sides of the rectangle are in the same direction, the short axes of the long holes are in the size of (L3-L1)/2+D, the long axes of the long holes are in the size of (L2-L4)/2+D, wherein D is the diameter of a screw of the workpiece to be mounted. The mounting seat is used for mounting of to junction boxes with two axis temperatures, communication among related departments is not required before production, the usage amount of the junction boxes with two axis temperatures is determined, the workload of each production unit is reduced, the production efficiency is improved, and the rework and change caused by the mounting problem of the junction boxes with two axis temperatures can be effectively reduced.