The utility model relates to a high-pressure heater heating steam source optimization system, and belongs to the technical field of thermodynamic systems. The device comprises a heating steam source Iconsisting of a first machine two-section exhaust pipeline, an exhaust pipeline valve group I, a low-pressure steam inlet I and a first machine first high-pressure heater, a heating steam source II is further included; the heating steam source II is composed of a second-section exhaust pipeline of a second machine, an exhaust pipeline valve set II, a low-pressure steam inlet II and a second high-pressure heater of a first machine. low-pressure extraction steam from a second-section extraction pipeline of the first machine passes through an extraction pipeline valve group I; the low-pressure steam is from the low-pressure steam inlet I; after being gathered to a low-pressure steam main pipe, the steam enters a first machine and a first high-pressure heater; low-pressure extraction steam from a second-section extraction pipeline of the second machine and low-pressure steam from a low-pressure steam inlet II are gathered to a low-pressure steam main pipe through an extraction pipeline valve set II and then enter the second high-pressure heater of the first machine, consumption of high-quality medium-pressure steam is reduced, and the use amount of the low-pressure extraction steam isincreased.