The invention discloses a price-volume circulation method of a substation project, and particularly relates to a method for rapidly applying project quantity data in power quantity calculation software to valuation software for valuation. The method comprises the steps that an interface file is generated by utilizing the power quantity calculation software, wherein the interface file comprises building, installation and line service module data in the power quantity calculation software; the power quantity calculation software links with the valuation software and imports the interface file. Data interfaces between the quantity calculation software and the valuation software are unified, and efficient data exchange between the quantity calculation software and the valuation software can be formed, so that compared with manual input of the project quantity data in the prior art, the efficiency and accuracy are greatly improved, and manpower and materials are greatly saved.