Lightweight roof photovoltaic panel support structure

The utility model discloses a light-weight roof photovoltaic panel support structure, which comprises a photovoltaic mounting mechanism used for mounting a photovoltaic panel and enabling the photovoltaic panel to move, a second connecting plate, a supporting plate and a quick replacement mechanism used for quickly dismounting and mounting the photovoltaic panel. The beneficial effects are that the photovoltaic installation mechanism can slide in the slide rail, when a certain group of photovoltaic panels breaks down, the guide rail plate is moved, the guide rail plate is aligned with the slide rail of the group of photovoltaic panels which break down, the first installation plate is rotated, the guide rail plate is driven to rotate, the baffle plate is pressed down by the pressing block, the photovoltaic installation mechanism is pushed out, and the photovoltaic panels are replaced. The photovoltaic installation mechanism is pushed back into the sliding rail again, the first installation plate drives the gui