The invention provides a method for obtaining an unmanned aerial vehicle patrol inspection benefit assessment model of an electric transmission line. The method comprises the following steps that determining an impact factor of an unmanned aerial vehicle for carrying out patrol inspection on the electric transmission line; according to the impact factor, constructing an unmanned aerial vehicle patrol inspection benefit assessment index; adopting an analytic hierarchy process to determine an unmanned aerial vehicle patrol inspection benefit assessment index weight, and obtaining the unmanned aerial vehicle patrol inspection benefit assessment model; and solving the unmanned aerial vehicle patrol inspection benefit assessment model to obtain an unmanned aerial vehicle patrol inspection benefit assessment result of the electric transmission line. The method which is put forward by the invention is reasonable and accurate, the unmanned aerial vehicle patrol inspection benefit assessment model, which is established by the method, of the electric transmission line can be used for assessing the benefits of different types of unmanned aerial vehicle patrol inspection electric transmission lines and is also used for comparing with other line patrol inspection ways, line patrol inspection benefits are effectively improved, a scientific and reasonable basis is provided for popularizing an unmanned aerial vehicle patrol inspection electric transmission line technology, meanwhile, an assessment method is provided for production units, and a patrol inspection way is optimized.