In view of the problem that the lightning electromagnetic pulse invades the transmission channel of the communication system, resulting in interference or even damage to the power amplifier, a lightning protection module is designed to realize the decrease of the amplitude and specific frequency components of the lightning electromagnetic pulse, and protect the power amplifier from the influence of lightning intrusion. The module comprises a transient protection circuit and a filtering circuit, and the transient protection circuit is mainly to limit the lightning-induced voltage and transfer the relevant current caused by lightning; the filter circuit suppresses the low-frequency components of lightning below 1 MHz. After simplifying the transmission channel of the communication system, installing the protection module and simulating the lightning current intrusion of 8/20 μs, the peak power of the power amplifier will not exceed 30 dBm, which is less than the minimum value of the tolerable peak threshold power range. The experiment carries out the intrusion of lightning electromagnetic pulse on the simplified transmission channel, and the gain data shows that there is no obvious gain compression of the amplifier at the center frequency of 144 MHz, which indicates that the protection module can effectively protect the sensitive components.