The utility model provides an AC-DC flexible configuration megawatt grade modularization inverter outdoor test platform. An input end and an output end of a direct current bus of a direct current input platform are respectively connected with a photovoltaic assembly unit and an input end of an inverter through switches; an input end of a transformer of an alternating current output platform is connected with an output end of the inverter through a switch; two output branches of the transformer are respectively connected with an alternating current test bus and an alternating current power generation bus through switches; and the alternating current output platform is connected with a test monitoring platform. Compared with the prior art, the outdoor inverter test platform has a test capacity in a range of 100kW to 1MW, can test multiple inverters simultaneously, guarantees inverter test efficiency and develops tests on low voltage crossing capability, electrical network adaptability, electric energy quality and power control.