The invention discloses a starting system for a thermal power plant adjacent machine auxiliary steam heating boiler. The starting system for the thermal power plant adjacent machine auxiliary steam heating boiler comprises two steam turbine auxiliary steam headers and two deaerators, wherein the two deaerators are connected with the two steam turbine auxiliary steam headers through steam pipelines and adjusting valve stations respectively, the two steam turbine auxiliary steam headers are connected through an auxiliary steam connecting mother tube, the specification of the steam pipelines between the deaerators and the steam turbine auxiliary steam headers is Phi720*14, the specification of each adjusting valve bypass is Phi530*13, and the specification of the auxiliary steam connecting mother tube between the two steam turbine auxiliary steam headers is Phi377*9. The starting system has the advantages that due to the fact that the steam pipelines between the deaerators and the steam turbine auxiliary steam headers and the auxiliary steam connecting mother tube between the two steam turbine auxiliary steam headers are enlarged and improved in specification, a heating method also correspondingly changes, oil consumption can be reduced, and operating cost is reduced.