More and more intelligent households enter into people's lives. How to control the smart home in a simple and effective way becomes a difficult problem. This paper designs a wireless voice control system, consisting of the speech recognition module, microcontroller, wireless transmitting module and the wireless receiving module. In the program, sending "hello" into the chip by simply setting the chip registers can identify "hello" by the chip. The experimental results show that the voice module can accurately identify the password and send signals through the wireless transmitting module, and control the electric power on and off in real time. The system can control home appliances more easily instead of the manual contact power switch