The invention relates to an abnormality handling method of a static synchronous compensator (STATCOM) power module. The abnormality handling method comprises the following steps of detecting a return state of each power module, disconnecting an STATCOM with a bus if an abnormal state exists, controlling the STATCOM to be grounded, and achieving DC voltage discharge of the STATCOM; using a conductor to make each abnormal power module short-circuited to achieve bypass, and setting a corresponding position of each abnormal power module to a controller; judging whether the STATCOM conforms to a redundancy running condition or not, adjusting a corresponding relation between a normal power module and a control position again if the STATCOM conforms to the redundancy running condition; and achieving asymmetrical re-starting of the STATCOM by a voltage sharing control strategy. The method is applicable for the STATCOM without a bypass mechanism, the abnormal module is bypassed by manual, and the corresponding relation between the normal module and the control position is adjusted again by the controller according to the abnormal module position manually set so as to achieve asymmetrical re-starting control.