The utility model relates to the field of conductor monitoring of a transmission line, in particular to a real-time monitoring system for conductor icing of an overhead transmission line. The real-time monitoring system comprises a dip angle-temperature monitoring device, a deviation angle-wind yaw angle monitoring device and a monitoring system host, wherein the dip angle-temperature monitoring device is arranged on each line conductor; the deviation angle-wind yaw angle monitoring device is arranged on each suspension insulator string; the monitoring system host is arranged on site or at a monitoring center; the deviation angle-wind yaw angle monitoring device is connected with the dip angle-temperature monitoring device; and the dip angle-temperature monitoring device is in wireless connection with the monitoring host. The real-time monitoring system has the benefits that the dip angle at the suspension point of the line conductor, the conductor temperature and the deviation angle of the suspension insulator string can be measured in real time so as to realize the real-time computation of the comprehensive load of the iced conductor, the real-time monitoring for the whole process of formation, development and deterioration of the line icing can be realized, and the utility model is a real-time monitoring system for conductor icing of the overhead transmission line with complete, practical and effective functions in China.