The invention discloses a generator set regulating performance test method comprising the steps that the control model of a generator set to be tested is established; the test sequence of test items is set; the test parameters of the test items are set; and the operation parameters of the generator set to be tested are acquired in real time, and testing of the test items is performed in turn according to the set test sequence. The invention also discloses a generator set regulating performance test platform comprises an under test generator set control model module, an under test generator set state acquisition module, a test item configuration module, a test module and a storage module. Three types of grid-contented generator set regulating performance test items are preset for testing the regulating range, the regulating performance and the capacity of participating in ACE adjustment of the object, and real-time statistics of the regulating performance of the test object can be performed so that the work of automatic maintenance personnel of a dispatching center can be greatly reduced, automatic and standardized grid-connected testing of the new generator sets can be realized and the test process is fair and just.