The utility model relates to a data transmission device. A wireless transmission module is used for receiving data of sensors and transmitting the data to a micro processor; and the micro processor is used for processing the received data, adding corresponding route information and sending the information to a monitoring center by a GPRS (General Packet Radio Service) wireless transmission module. The data transmission device can be arranged on a power transmission line pole tower and can be used for uploading the data of sensors including a fault indicator, a sag monitor, a temperature current monitor and the like to the monitoring center. And therefore, various monitoring systems can realize sharing of the same data transmission platform, so that the installation workload is saved and the pole tower burden is relieved.