Oil-immersed three-phase transformer

The invention provides an oil-immersed three-phase transformer which comprises a transformer shell, supporting columns are fixedly installed at the left end and the right end of the inner wall of the bottom of the transformer shell, a supporting plate is fixedly installed between the top ends of the supporting columns, a motor is fixedly installed at the left end of the bottom of the transformer shell, and a storage battery is fixedly installed at the left bottom end of the transformer shell; an emergency assembly for continuously maintaining heat dissipation after external power failure is movably mounted between the top right end of the supporting plate and the upper right end of the interior of the transformer shell, and comprises a sensing assembly for responding after sensing that the heat temperature rises and a starting assembly for timely starting a standby power supply for heat dissipation; the induction assembly and the starting assembly are movably installed between the top right end of the support