Overwater photovoltaic transformer substation and transformer substation box thereof

The invention relates to an overwater photovoltaic transformer substation and a transformer substation box thereof. The transformer substation box comprises a box body, a permeable plate and a rain shielding structure. The box body comprises a top plate, a bottom plate opposite to the top plate and a side plate connecting the top plate and the bottom plate. An accommodating cavity is defined by the top plate, the bottom plate and the side plate. An opening communicated with the accommodating cavity is formed in the side plate. The permeable plate is installed at the edge of the opening and covers at least part of the opening. The permeable plate is provided with a plurality of ventilation holes communicated with the accommodating cavity. Openings, located in the outer surface of the permeable plate, of the ventilation holes are arranged towards the bottom plate. The rain shielding structure is installed at the edge of the end, close to the top plate, of the opening. The rain shieldingstructure protrudes out o