The invention relates to a method for determining meteorological risks of the surrounding of a transmission tower in an electric power system, and belongs to the technical field of analysis and decision-making for operation of electric power systems. The method includes the steps of: respectively establishing a thunderstorm risk evaluation equation, a typhoon risk evaluation equation, a forest fire risk evaluation equation, a rainstorm risk evaluation equation and an icing risk evaluation equation of the tower to be evaluated at current moment by taking a tower to be measured as a center and classifying according to a set area radius, and at least obtaining the comprehensive environmental meteorological risk result of the tower evaluated at present. According to the method provided by the invention, based on monitored data and external meteorological forecasting information obtained by online monitoring devices for microclimate and icing of a power transmission line, by giving consideration to the severity of the meteorological environment and distance between the meteorological environment and the evaluation object, and taking full account of the time and space variation characteristics of environmental meteorological risks, a multistage evaluation area scheme is adopted, so that the space-time transformation trend of the environmental meteorological risks can be more reasonably and accurately reflected and forecasted to a certain extent.