Abstract: This articl proposes a new portable safety helmet system based on i.MX27 in coal mine, introduces the system composition and software and hardware realization method. Through the application of i.MX27 multimedia processing hardware platform, the system realizes environmental parameters monitoring, real-time data transmission, voice communication, video transmission and other functions. In the case of cutting off power supply under coal mine, it is capable of using battery to quickly establish wireless communication link, respose the underground scene to ground control system quickly, thus has good reliability and adaptability.