The invention discloses an electric automobile charging network planning method. The method comprises the following steps: generating a plurality of charging station position landmarks in an area to be planed; when an interval between any two charging station position landmarks is greater than a set distance, setting all the charging station position landmarks as alternative schemes; when the quantity of the alternative schemes is equal to a set value, planning a charging service area covered by each charging station position landmark by use of a Voronoi diagram; selecting an alternative scheme whose total service radius is the largest among all the alternative schemes as an addressing scheme; when total charging capacity of all charging stations satisfies a constant volume constraint, calculating a complete-cycle cost of the charging stations; updating charging capacity of each transformer station in the planning area through combination with the complete-cycle cost by use of an improved particle swarm algorithm; and when the total updated charging capacity of all the charging stations satisfy the constant volume constraint and the iteration frequency of the charging capacity of each charging station is greater than set frequency, outputting a complete-cycle cost and charging capacity of each transformer station.