Frame, photovoltaic module, module installation structure and assembly method thereof

The invention discloses a frame, a photovoltaic module, a module installation structure and an assembly method thereof, the frame comprises a cavity, the cavity is formed by a first side wall, an inner wall, a second side wall and a bottom wall which are connected in sequence, the first side wall and the second side wall are oppositely arranged, and the inner wall and the bottom wall are oppositely arranged; a clamping groove structure is arranged on one side, far away from the first side wall, of the second side wall, the clamping groove structure comprises a first clamping groove structure and a second clamping groove structure connected with the first clamping groove structure, the first clamping groove structure is used for clamping a fastener, and the second clamping groove structure is used for clamping a connecting piece. The frame does not need to be secondarily processed, so that the frame processing efficiency is improved, the frame manufacturing cost is reduced, meanwhile, the length of the C face