The invention discloses a multistage draw-out type photovoltaic frame assembly, and the assembly comprises a container, a frame with at least two stages, a lower limiting assembly, an upper limiting assembly and a supporting rod, wherein the first-stage frame is suitable for the drawing and storing from the front of the container, and the second-stage frame is suitable for the drawing and storingfrom the front of the first-stage frame. During the drawing of the frame, a front baffle abuts against the rear end of a front limiting plate to limit the frame; when the frame is folded, a round holein the rear baffle is suitable for the passing of a lower positioning pin on a rear baffle of the next stage, and meanwhile, the upper sliding block is inserted into an upper clamping groove to playa role in guiding and limiting when the frame is folded. A limiting hole is formed at the bottom of the supporting rod at the front end of the frame of the last stage and matched with the frame positioning pin on the container bottom plate. Through cooperation of the upper limiting assembly, the lower limiting assembly and the supporting rod, it is guaranteed that the frame is kept horizontal after being drawn out or retracted, the position of the frame can be fixed after being retracted and is not prone to sliding out, and the system stability and reliability are improved.