Overwater photovoltaic substation and substation installation method thereof

The invention provides an overwater photovoltaic substation and a substation installation method, the overwater photovoltaic substation comprises a floating base, a bottom frame is arranged at the top end of the floating base, the bottom frame is composed of a plurality of I-shaped steels, the I-shaped steels are welded together, and two fixed cross rods are welded between two adjacent vertically arranged I-shaped steels. The top ends of the two fixed cross rods are fixedly connected with a plurality of photovoltaic assemblies, and the top ends of the two fixed cross rods are fixedly connected with a power transformation box at one corner of the bottom frame. The overwater photovoltaic substation has the advantages that the photovoltaic substation is convenient to mount by the aid of the preassembled floating base and the underframe, the mounting efficiency of workers is improved, insulating oil leaked from the oil-immersed transformer is collected and stored through the formed wedge-shaped groove and the sto