The invention relates to a light-weight high-strength orbit control cabin L-shaped mounting frame. The L-shaped mounting frame aims to solve the problem that the rigidity and the weight of the mounting frame cannot meet the requirements of a test task while the mounting frame and a fixing support are reliably fixed in the prior art. The L-shaped mounting frame comprises a ring-shaped product mounting plate, a rectangular lower bottom plate, a plurality of connecting plates arranged between the product mounting plate and the lower bottom plate, and a reinforcing plate arranged between the two outermost connecting plates and the lower bottom plate; and the inner diameter of the product mounting plate is matched with the major diameter of an orbit control cabin, the product mounting plate isprovided with a mounting hole, an anti-sway hanging point hole and a buffer hanging point hole, the product mounting plate and the connecting plates are located on the same plane, the connecting plates are vertically connected with the rear side edge of the lower bottom plate, the lower bottom plate is provided with at least two force-bearing clamping grooves, the lower edge of the reinforcing plate is vertically and fixedly connected with the side edge of the lower bottom plate, the rear side edge of the reinforcing plate is vertically and fixedly connected with the outer side edges of the connecting plates, and the length, the width and the height of the outline of the mounting frame are not less than 2100 mm, 350 mm and 2200 mm respectively.