The invention provides a method for improving insulation recovery performance of a spark gap for series compensation. The method comprises the following steps: step 1, mounting an instantaneous ventilating device on a series compensation device; and step 2, acquiring alternating current of the spark gap of the series compensation device by using the instantaneous ventilating device, supplying air to the spark gap if the alternating current is acquired, and entering a standby state if the alternating current is not acquired. Compared with the prior art, the method for improving the insulation recovery performance of the spark gap for series compensation does not change a body structure of an existing spark gap for a series compensation device, is convenient to mount and modify and good in feasibility; and safe and stable running of the existing spark gap for the series compensation device is not affected, and the device is simple and convenient in design and high in reliability.