The present invention relates to an overhead transmission line windage yaw feature monitoring system, and an overhead transmission line windage yaw feature test method and device. The system comprises a microclimate test device, a wireless receiving device and a server, and also comprises a plurality of test loops erected among poles; each test loop comprises two leads to be tested connected with a strong current generator and windage yaw monitoring devices respectively arranged at the center of the span length of each lead to be tested; when the strong current generator loads current to the leads to be tested, the microclimate test device collects meteorological environment data in real time and transmits the meteorological environment data to the server through the wireless receiving device; the windage yaw monitoring devices collect windage yaw data of the leads to be tested in real time and transmit the windage yaw data to the server through the wireless receiving device; and the server performs classification processing of the meteorological environment data and the windage yaw data to obtain the windage yaw feature data of the leads to be tested. The overhead transmission line windage yaw feature monitoring system, and the overhead transmission line windage yaw feature test method and device can accurately reflect the relation of the windage yaw angles, the offset angles and the wind speeds of the leads.