The utility model discloses a three -phase distribution transformer temperature -rise tests system based on exchange low frequency heating, include: the power is inputed to three -phase four -wire low pressure, the three -phase is adjustable, and low frequency variable frequency power supply and quilt try transformer series connection in proper order, and output signal collection module and temperature measurement sensor module are connected respectively with by the examination transformer, and the main control unit is connected respectively with the adjustable low frequency variable frequency power supply of three -phase, output signal collection module and temperature measurement sensor module, the main control unit sends the instruction of pressure regulating frequency modulation according to the feedback signal of output signal collection module, temperature transducer to the adjustable low frequency variable frequency power supply of three -phase. The utility model discloses beneficial effect: because output frequence is low, can reduce the required experimental power capacity of temperature -rise tests, need not large capacity regulator and reactive power compensator by a wide margin.