The invention relates to a power supply apparatus, namely, an electric energy meter wiring electric corrosion prevention pressing plate. The electric energy meter wiring electric corrosion prevention pressing plate comprises a cylindrical body, and is characterized in that the middle and one side of the cylindrical body are provided with an opening, the upper and lower surfaces inside the opening are provided with spiral threads, and the whole body is completely tinned. The opened pressing plate can be deformed, thereby increasing the connection area of a wire, reducing the contact resistance, being firm in connection point and reducing heat generation of the connection point. The electric energy meter wiring electric corrosion prevention pressing plate uses tin or zinc to perform material transition, solves a problem of electric corrosion, solves a problem of copper-aluminum transition and copper-iron transition electric corrosion and reduces heat generation of the connection point. The electric energy meter wiring electric corrosion prevention pressing plate is reasonable in structure, compact, flexible and easy to use.