The invention relates to a power transmission line ice coating pre-warning systems, in particular to a power transmission line ice coating pre-warning system based on video monitoring, and solves the problem that currently no power transmission line ice coating pre-warning system exists. According to the technical scheme, the power transmission line ice coating pre-warning system comprises a video collecting module, an image processing and analyzing module, a data storage module and a state display and pre-warning module. The video collecting module comprises a plurality of cameras and a wireless data transmission chip. The cameras are connected with the wireless data transmission chip. The image processing and analyzing module comprises a wireless data receiving device and a PC, wherein the wireless data receiving device is connected with the PC. The data storage module comprises a CPU and a storage device. The state display and pre-warning module comprises a sound pre-warning device and a lighting pre-warning device. The PC of the image processing and analyzing module is connected with the data storage module which is connected with the state display and pre-warning module. The power transmission line ice coating pre-warning system has the advantages that manual routing inspection is not needed, and production safety accidents are reduced, and the system is high in instantaneity, capable of being upgraded, and high in fault tolerance.