Composite iron tower bearing platform suitable for frost heaving area and construction method

The invention discloses a composite iron tower bearing platform suitable for a frost heaving area and a construction method. The iron tower bearing platform has the gradient functions of high durability and high toughness and comprises a tower foot steel structure embedded part, a UHPC prefabricated base, a UHPC prefabricated shell and core area functional gradient concrete, and the tower foot steel structure embedded part is of a hollow bell-shaped appearance; and shape parameters are optimized by utilizing a topology technology, so that the strength requirement of stress transmission is met under the condition of minimum material consumption, and the self weight of the structure is reduced. The UHPC component is prefabricated and maintained in a factory, the quality of the component is guaranteed, and meanwhile the factory level of a project is improved; on the construction site, rapid assembly construction is achieved through annular notches formed in the UHPC prefabricated base, the construction speed is