The invention discloses a discharge counter surface dehumidification method and a discharge counter surface dehumidification device. Temperature and relative humidity of a discharge counter surface are detected, and according to the temperature and the relative humidity of the discharge counter surface, whether rain and dew or ice exists, when discharge counter surface dehumidification is executed, is estimated and judged, and if the rain and dew or ice exists when discharge counter surface dehumidification is executed, a fan is started, the fan provides wind force to the discharge counter surface, and under the action of the wind force, the rain and dew or ice of discharge counter surface dehumidification is removed, thus, a problem of failure in check of lightning stroke times recorded by a discharge counter due to existence of the rain and dew or ice on the surface of the discharge counter surface is solved. The discharge counter surface dehumidification method provided by the invention is convenient, easy and efficient in an implementation process, and the discharge counter surface dehumidification device is simple in composition structure and easy to be generalized and used.