The utility model relates to a data transmission device used in electric power information acquisition. The data transmission device comprises a processor, wherein the processor is respectively connected with a power supply circuit, a GPRS (General Packet Radio Service) circuit, an Ethernet circuit, a serial port circuit, a hardware watchdog circuit and an external reset circuit; and the processor is responsible for protocol conversion of GPRS wireless data and serial port data, converts the wireless data received by the GPRS circuit into the serial port data, and communicates with a power distribution cabinet through the Ethernet circuit or a RS232 serial port circuit. The data transmission device communicates with a background server in a wireless connection manner, so that potential safety hazard to the project caused by wiring is reduced; the data transmission device transmits the information in the power distribution cabinet through various interfaces, such as the RS232 interface or the Ethernet; the anti-interference performance of the system is enhanced, and differential mode interference and common mode interference are suppressed better; thunder-proof design is used in the power supply part, and each data line is protected by a thermistor; the system has two functions of manual reset and automatic reset, so that the stability of the system is enhanced; and the thunder-proof design is used in the device, thus, the accident rate is lowered.