Aiming at the problem that wireless communication systems are easy to be damaged under the influence of strong electromagnetic pulses， this paper took the suction cup antenna and its receiving circuit as an example and studied the coupling effect of strong electromagnetic pulses and the protection design at the receiving end of the wireless communication system. The suction cup antenna model was established using CST software， and its coupling voltage was simulated， and then the coupling voltage was imported into ADS software to test the coupling voltage of each port of the receiving circuit. According to the time-frequency domain waveform of the coupling voltage， a three-level protection circuit composed of a surge protection device， a PIN limiting circuit， and a filter circuit was designed. After simulation verification， for a 6 000 V antenna coupling voltage， the output voltage after the protection circuit was only about 1.2 V， with insertion loss less than 3dB， and the protection effect reached up to 73 dB， which is far higher than the common protection efficiency. The designed scheme provides effective protection against a strong electromagnetic pulse.