At present, 110 kV lines of smart substation mostly adopt double line protection, and the process layer double network is configured for each protection. Due to the inconsistent specifications in the early stage planning of smart stations, there is a potential cross-dual network problem in the double protection lock-reclosing coordination mode of some smart stations. In view of this, this paper studies the dual protection network structure of 110 kV transmission lines, and analyzes the coordination logic of mutual lock-reclosing of dual protections. An improved cross double network locking reclosing coordination mode is proposed. The calculation method of cross-network communication risks of substation blocking reclosing signals is given. Then the 110 kV double lines of 220 kV smart substation are taken as an example for case analysis, the results show that the proposed method greatly improves the communication reliability. Finally, the data in an actual substation is taken to calculate the risk of the method, which provides a guideline for improving the reliability of intelligent station cross dual network communication.