Photovoltaic power generation device with waterproof structure

The invention discloses a photovoltaic power generation device with a waterproof structure, and the device comprises a plurality of groups of photovoltaic power generation assemblies which are transversely and longitudinally arranged, any group of photovoltaic power generation assemblies comprises a photovoltaic unit and a frame, and the frame comprises a clamping part which is used for wrapping the four side edges of the photovoltaic unit; the extension part is arranged along the end surface of the clamping part on the back plate side of the photovoltaic unit; wherein the frames comprise a left frame, a right frame, an upper frame and a lower frame, an extension part on the left frame is provided with an outer water tank, and a clamping part on the right frame is provided with a lap joint part; the lap joint part of one group of photovoltaic power generation assemblies is buckled with the outer water tank of the other group of photovoltaic power generation assemblies which are transversely adjacent to the gr