At present, the monitoring system of dancing animal unions on high-voltage overhead transmission lines still has shortcomings, such as low integration and large errors. To solve this problem, a multi-mode spatial distance weight correction model based on the combination of spherical distance and spatial distance is established. Based on the Beidou satellite positioning system, a high-voltage overhead transmission line galloping monitoring module is developed. This can be integrated into the intelligent monitoring ball device. Then a galloping measurement method for high-voltage overhead transmission lines based on multi-mode spatial distance weight fusion is developed. Experimental results show that the positioning accuracy of the high-voltage overhead transmission line galloping monitoring device can reach centimeter level, and the positioning result can effectively assess the galloping risk of the transmission line. It has been installed for the online monitoring of overhead high-voltage transmission lines. This work is supported by National Key Research and Development Program of China (No. 2017YFA0700300) and Zhejiang Key Research and Development Program (No. 2018C01081).