From the perspective of new urbanization construction of the Yangtze River economic belt, in this paper we firstly analyze the financing demand of it, and then describe the disadvantages of the traditional mode of financing, and finally explore how to construct diversified and sustainable urbanization financing mechanism. Financing is one of the key links in the construction of urbanization. However, because financial investment of traditional financing mode cannot meet the requirements, and "land finance" is unsustainable, it would bring huge debt risk to local financing platform, greatly restricting the promotion of new urbanization. The new market-oriented financing needs certain basic conditions, and meanwhile there are also some risks. In view of this, new urbanization construction of Yangtze River economic belt should proceed from reality, to create a variety of market financing conditions while regulating traditional financing mode. The objective is to build the new market-oriented financing mode of diversified investment subject and financing way, and implement different combinations of financing in different regions inside and outside the province.