Summary: This article first learns the principle of ECG signal acquisition and understands the Bluetooth data transmission method. In terms of signal acquisition methods, research advanced techniques and principles in the acquisition field. These include oversampling techniques, adaptive coherent template methods to filter narrow-band signal interference, and the basic principles of digital phase locking. In terms of filtering narrow-band interference, a multi-narrow-band rejection filter designed according to the coherent adaptive template method. The optimization algorithm designed according to the digital phase-locked algorithm. The goal of this article is to realize the real-time collection and monitoring of ECG signals in the sports competition process-oriented to the Internet of Things. Its function is to collect the physiological signals of ECG and send the data of the physiological signals through wireless transmission technology.