The invention discloses a control method for improving the abnormal voltage withstand capability of a wind turbine generator set by a super capacitor. The super capacitor is added to a control system for improving the abnormal voltage withstand capability of the wind turbine generator set by the super capacitor; the system comprises a wind wheel, a gear case, a generator, a converter, a crowbar protection and a box transformer substation; the wind wheel, the gear case, the generator, the converter and the crowbar protection are orderly connected with one another; the box transformer substation is connected with a power grid; the super capacitor is added to a DC bus of the converter; the super capacitor is connected with the DC bus of a wind turbine converter through a DC/DC converter; and coordinated control of an integrated system is carried out on an energy storage system and the converter added to the super capacitor. According to the control method, the problems that the doubly-fed wind turbine generator set withstands low-value transient disturbance of a network voltage and continuously runs at a high/low voltage are solved; an original control strategy of the wind turbine generator set is basically not changed; the control structure and algorithm are simple and reliable; the effect is good; and operation and the service lifetime of other components of the wind turbine generator set are not affected.