Joint fixing piece for roof photovoltaic power generation system

The invention provides a joint fixing piece for a roof photovoltaic power generation system. The joint fixing piece comprises blind holes, through holes, a bracket, clamping rods, guide plates, a cross plate, movable frames, screw rods, threaded holes and lower support plates, wherein the blind holes are formed in the upper end face of an aluminum frame; the through holes are formed in the lower end face of the bracket; the blind holes and the through holes are connected through the clamping rods; the clamping rods are assembled inside the guide plates; the guide plates are fixed to the middleposition of the left end face of the bracket; the cross plate is fixed to the upper end of the bracket. According to the design, the joint fixing piece can be arranged conveniently; the mobile framesare assembled on the outer surface of the cross plate; the threaded holes are formed in the lower end faces of the movable frames; the screw rods are assembled inside the threaded holes; the lower bracket is assembled inside