The utility model provides a data transmitting system, a serial communication port, data transmitting system includes that mobile communication terminal, couple in router, hardware prevents network system in hot wall and the electric force information, the network system includes safe access gateway and server in the electricity force information, and wherein, the mobile communication terminal is via wireless network connection to the couple in router, and the couple in router is connected to hardware and prevents hot wall to prevent through being connected to hardware that hot wall's safe access gateway is connected to the server. Adopt the utility model discloses a data transmitting system can guarantee data transmission's between mobile communication terminal and the electric force information intranet security and reliability, has avoided data to be revealed in the transmission course.