The invention discloses an inverse-time-limit transformer substation voltage control method and device. In the control method, a main variable tapping point of the transformer substation is regulated and configured with inverse time limit delay; an inverse time limit control scheme is started when a supply voltage of the transformer substation is beyond specified upper and lower limit values; different regulation time limits are selected according to the difference value between the supply voltage and the upper and lower limit values; the larger the difference value is, the shorter the voltage regulation time is, and the smaller the difference value is, the longer the voltage regulation time is. The method and the device disclosed by the invention have a beneficial effect that the ubiquitous problems about frequent regulation and regulation oscillation of the main variable tapping point in a current transformer substation are obviously reduced.