As one of the current key communication technologies, LiDAR network electronic communication faces an increasing level of security risks as its application scope continues to expand, resulting in the inability to effectively guarantee the security of electronic communication data transmission. Therefore, this article proposes a secure transmission method for electronic communication data in LiDAR networks based on symmetric encryption. This method introduces symmetric encryption algorithms to build a secure transmission framework for electronic communication data in LiDAR networks. Under this framework, electronic communication data is encrypted through data processing, byte substitution, row shifting, column obfuscation, and round key addition, while determining the key extension mode. The decryption process is completed through ciphertext processing, reverse row shifting, reverse byte substitution, reverse column obfuscation, and reverse round key addition, thereby achieving secure transmission of electronic communication data. The experimental results show that the minimum secure transmission time of electronic communication data obtained by the proposed method is 1 second, and the minimum transmission loss rate of electronic communication data is 0.6%, fully confirming that the proposed method has better application performance.