As a new production factor, data plays a key role in promoting the transformation and upgrading of libraries in the digital era. Clarifying the mechanism of data value realization in the construction of smart library, accurately grasping the realization path of data value to promote the wisdom of library, and building the system of data value realization in the construction of smart library in China on this basis are the key to effectively release data value to complete the construction of smart library. Specifically, it includes improving the circulation and trading system of data elements, and building a complete library data trading platform; Improve the security governance system of data elements, and build a trusted environment for the effective use of data in the construction of smart library; Privacy computing technology is applied to provide technical support for data value release in the construction of smart library.