The invention relates to a method for drawing regional distribution diagram of galloping of iced power grid in a special return period. The method comprises the following steps of: collecting and analyzing related weather data of galloping after icing; establishing a high-resolution space-time climate database according to the weather data; estimating duration of a galloping process according to the database; calculating duration of galloping in the special return period according to the duration of the galloping process; drawing a regional distribution diagram of galloping of iced power grid in the special return period; correcting the regional distribution diagram of galloping of the iced power grid in the special return period according to practical operating experience and geographical conditions of power transmission lines. The technical scheme of the invention provides the basis and the guidance for the works, such as planning, design and operating maintenance, for the power transmission lines.