The Internet of Things usually consists of a large number of sensor nodes, which are distributed over a wide range of areas. Faced with a vast network topology, how to efficiently calculate and select the optimal communication line is a challenge. The optimal communication line selection involves multiple optimization objectives, such as transmission distance, energy consumption, etc. Taking into account the above factors, a method for selecting the optimal communication line of laser sensor nodes in the Internet of Things is proposed. Select inflection nodes in sensor nodes to reduce the number of transmission times of sensor nodes. Taking the minimum energy consumption and shortest path as path selection objectives, a routing algorithm is introduced to obtain the optimal communication line from multiple paths while considering node energy balance. After experimental verification, the proposed method can effectively find the shortest transmission path with low energy consumption and high data integrity in data transmission, indicating that the application effect of this method is good.