The utility model discloses a heat-engine plant adjacent machine auxiliary steam heating boiler starting system, which comprises two steam turbine auxiliary steam headers and two deaerators, wherein the two deaerators are respectively connected with one steam turbine auxiliary steam header and a control valve station through a steam pipeline, the two steam turbine auxiliary steam headers are connected through an auxiliary steam connecting main pipe, the specification of the steam pipeline between the deaerators and the steam turbine auxiliary steam headers is phi (Phi)720*14, the specification of a control valve bypass is Phi530*13, and the specification of the auxiliary steam connecting main pipe between the two steam turbine auxiliary steam headers is Phi377*9. The heat-engine plant adjacent machine auxiliary steam heating boiler starting system has the beneficial effects that a heating method of the heat-engine plant adjacent machine auxiliary steam heating boiler starting system also changes correspondingly by enlarging and improving the steam pipeline between the deaerators and the steam turbine auxiliary steam headers and the auxiliary steam connecting main pipe between the two steam turbine auxiliary steam headers, thereby being capable of reducing oil consumption, and reducing operation cost.