The invention discloses a method for preventing and controlling mountain fire external force damage to a transmission line. The implementation steps of the method comprises the steps that: mountain fire hazards of the transmission line are determined, each mountain fire hazard in a field is investigated through investigation personnel, and the information of each mountain fire hazard is recorded in a management system; the management system pushes messages to management personnel and maintenance personnel of the transmission line according to a current time, weather warning information and mountain fire alarm information; the management personnel of the transmission line issues a management and control task to maintenance personnel according to the pushed messages, the maintenance personnel receives the management and control task and then goes to the target position of the management and control task to eliminate hidden dangers or handle mountain fires, sends GPS positioning information to the management system through a smart device to realize trajectory report, and collects field multimedia information through the smart device to realize task report. According to the method, the prevention and control of mountain fire external force damage to the transmission line can be realized and the method is scientific, systematic, comprehensive, effective and normative.