Oil-immersed voltage stabilizer is a kind of electrical equipment, mainly composed of transformer tank, winding, insulation material and control system. The transformer oil tank is a shell used to store transformer oil and protect internal components. It has good sealing and heat dissipation properties. Coils with windings made of highly conductive materials are used to transmit electrical energy and maintain a stable operating temperature through cooling of transformer oil. Insulating materials include cardboard, insulating paint, epoxy resin, etc., used to protect windings from electromagnetic interference and the influence of the external environment. The control system consists of voltage regulators, electronic sensors and monitoring equipment, etc., and is used to achieve stable voltage output and monitor working status.