Steam turbine with power-losing self-start emergency oil supply system and work method of steam turbine

The invention discloses a steam turbine with a power-losing self-start emergency oil supply system and a work method of the steam turbine. The steam turbine with the power-losing self-start emergency oil supply system comprises a steam turbine body, a lubricating oil system and the emergency oil supply system, wherein the power-losing self-start emergency oil supply system and the lubricating oil system are connected in parallel. The steam turbine is characterized in that the power-losing self-start emergency oil supply system comprises an emergency steam source, a power-losing emergency automatic start system, an auxiliary steam turbine and a centrifugal oil pump body, the power-losing emergency automatic start system is arranged on a steam pipeline connected with the emergency steam source, and the power-losing emergency automatic start system comprises an electromagnetic pneumatic linkage door and a quick closing main steam door which are connected in series. Reliability of the steam turbine is guaranteed, lubricating oil can be effectively provided during outage, it is guaranteed that the steam turbine can be safely stopped when a rotor is in an idling curve, major accidents are prevented, and safe production performance of a power plant is improved.