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This application discloses a frequency-modulated timing test system and method for sprint events, including a wireless starter, an infrared finish line detection device, a central control unit, and a display device. The infrared finish line detection device is fixedly installed at the finish line of the track, while the central control unit and display device are fixedly installed at the referee's stand. Each of the wireless starter, infrared finish line detection device, central control unit, and display device is equipped with a 2.4G wireless communication module and a 433M wireless communication module. During communication, when the number of communication failures due to interference in any frequency band reaches a preset threshold, the system automatically switches to another frequency band for retransmission, thereby effectively avoiding interference, significantly reducing the probability of communication failure, ensuring the real-time and reliable delivery of key commands, and thus guaranteeing the accuracy of timing and the fairness of the test.