The invention provides an islanding testing method for a wind generating set. The method includes the following steps that testing conditions are determined; measuring points are selected; test items are selected, and islanding testing is performed on the wind generating set. According to the islanding testing method for the wind generating set, the islanding operation capacity and anti-islanding capacity of the wind generating set are tested. Through the method, operation data in the whole testing process are analyzed, and the islanding capacity of the wind generating set can be comprehensively embodied.