The invention discloses an electrical property evaluation method and device for a radome. The electrical property evaluation method for the radome comprises the following steps that: according to measurement, obtaining antenna radiation near region electric field information, and calculating the caliber surface electric field information of the antenna according to the near region electric field information; obtaining the model data information of the radome, and obtaining the subdivision surface meta-information of the radome according to the model data information of the radome; according tothe caliber surface electric field information of the antenna and the subdivision surface meta-information of the radome, calculating the far field information of the antenna and the far field information of an antenna system; and according to the far field information of the antenna and the far field information of an antenna system, calculating the electrical property parameter information of the radome. The radiation near region electric field information of the antenna is practically measured to obtain the caliber surface electric field information of the antenna so as to obtain the performance parameter information of the radome, calculation accuracy is guaranteed under a situation that antenna digital-to-analogue input is not depended, and the maneuverability of the electrical property evaluation of the antenna system of ''antenna+radome'' can be greatly improved.