The invention discloses a mapping method for ice coating region distribution of power grid. The mapping method for the ice coating region distribution of the power grid comprises the following steps: summarizing the regularity of weather and terrain features on the basis of years of historical meteorological data of a meteorological station, building a weather model which can represent the relationship between the thickness of ice coating of wires and meteorological elements, combining geographic elements and terrain feature elements to correct the model, calculating the thickness of the ice coating in various places of a region of recurrent interval of 30 years, 50 years and 100 years, verifying and revising the thickness of the ice coating in various places according to the experience of operation and maintenance, and completing the mapping of an ice area distribution map of the power grid. By means of the mapping method for the ice coating region distribution of the power grid, regularities of distribution of the thickness of the ice coating of the power grid can be accurately reflected, all regions can be covered, a basis can be provided for the design, operation, maintenance and technical transformation of the power grid, and meanwhile, a guiding function for new constructions of the region with no power facilities can be achieved.