Electrogastrography (EGG), a method of recording gastric electrical activity, is attractive in both research and clinical applications because of its noninvasive nature. However, the commercially available wireless EGG acquisition system is relatively expensive and the portability is poor. The internal circuit design is unknown, making it difficult to further adjust the system. To overcome these limitations, we have developed a multi-channel EGG acquisition system based on the idea of "low magnification and wide dynamic range". In the system, an analog front end (AFE) including preamplifier, right leg drive (RLD) and low-pass anti-aliasing filter is designed according to the characteristics of the EGG signal, and the high-precision analog-to-digital converter (ADC) is selected for EGG signal collection. The system has the advantages of high precision, low noise, low power consumption, low cost, and high portability. The wireless multi-channel EGG acquisition system can achieve the characteristics of portability and device miniaturization. We provide multiple differential channels for acquisition, which will be helpful to obtain more information about gastric slow wave propagation and coupling.