The embedded system has the characteristics of low power consumption, low cost and small volume. Wi-Fi technology has the advantages of fast transmission speed. Combined with the advantages of both, a Wi-Fi video acquisition and transmission system with stm32f407 as the control core is designed. In order to improve the real-time and stability of the system, the UCOS-III operating system has been transplanted. In addition, the application program of upper computer and mobile terminal APP based on Android operating system have been developed. To achieve remote access, the system sends the collected video data to Ali cloud for remote access. After testingt, the system is stable and the video transmission is smooth.