The divergence angle of laser is very small, and the beam quality directly affects the reliability and speed of communication, leading to redundancy of incremental big data. There is a problem of low residual load rate and high packet loss rate in laser communication network links. A method for selecting the optimal path for data transmission in laser communication networks based on big data analysis is proposed. Firstly, based on big data analysis technology, the beam quality increment of the laser communication network is calculated, and a routing decision function is established by combining the beam quality optimization cost, link transmission efficiency, link remaining load rate, and link bandwidth. Based on the decision function, the optimal path for laser communication network routing is obtained. Finally, performance testing experiments are conducted. The results indicate that the proposed method can describe the characteristics of routing changes in laser communication networks, with low link packet loss rate, high data transmission efficiency, and improved utilization of laser communication networks.