The invention discloses an energy-saving frequency converter loading system and an energy-saving frequency converter loading method. The energy-saving frequency converter loading system mainly comprises a tested frequency converter, a loading frequency converter, a load motor and a loading motor. The tested frequency converter is correspondingly connected with the DC bus of the loading frequency converter. The load motor is connected with the motor end of the tested frequency converter. The loading motor is connected with the motor end of the loading frequency converter. The load motor is connected with the output shaft of the loading motor through a coupling. The U end and the V end of the loading frequency converter are respectively provided with a first Hall current sensor and a second Hall current sensor. The energy-saving frequency converter loading system further comprises a controller which is connected with the loading frequency converter. The controller is connected with the first Hall sensor and the second Hall sensor. According to the energy-saving frequency converter loading system and the energy-saving frequency converter loading method, simple operation is realized in performing loading test on the frequency converter. Because the electric energy which is transmitted by the loading frequency converter returns to the tested frequency converter through a DC bus, no additional electric energy is required in loading the tested frequency converter, thereby performing an energy saving function.