The invention discloses a dual-boosting boiler water feed system for power station units. The system comprises a first-stage water feed pump boosting pump, a second-stage water feed pump boosting pump and a water feed pump turbine, wherein the water feed pump turbine is coaxially arranged between the first-stage water feed pump boosting pump and the second-stage water feed pump boosting pump or on one side of the first-stage water feed pump boosting pump and the second-stage water feed pump boosting pump. A large turbine extracts stream and acts so that the water feed pump turbine can drive the first-stage water feed pump boosting pump and the second-stage water feed pump boosting pump to rotate. The first-stage water feed pump boosting pump carries out first-stage boosting on low-pressure feed water so that the low-pressure feed water can become medium-pressure feed water, the medium-pressure feed water flows through multiple medium-pressure feed water heaters through a medium-pressure feed water pipeline, then is conveyed into the second-stage water feed pump boosting pump and is boosted again to form high-pressure feed water, and the high-pressure feed water enters a boiler finally. In the medium-pressure feed water heaters, the medium-pressure feed water exchanges heat with the steam extracted by the large turbine so as to be heated. According to the dual-boosting boiler water feed system for the power station units, the medium-pressure feed water heaters replace high-pressure heaters, and therefore the system pressure and the flow resistance are lowered, and the operation reliability, the safety and the economical efficiency of the units are improved.