The invention discloses a voltage resistance and partial discharging test circuit of a DC breaker and a test method. The circuit comprises a DC power supply, a balancing capacitor, a measuring currenttransformer, and a partial discharging tester. The DC power supply provides electric energy for a DC breaker test product to be measured. The balancing capacitor is in parallel connection with the DCbreaker test product to be measured. The measuring current transformer collects the difference signal of the DC breaker test product and the balancing capacitor, and the difference signal is amplified and output to the partial discharging tester. The partial discharging tester receives the amplified difference signal and measures the partial discharging amount of the DC breaker test product. Theinvention is advantageous in that the circuit and the method of the invention examine whether the voltage resistance and partial discharging amount of the DC breaker module meet the demand of design technology or not, and thereby the device insulation state of the DC breaker can be correctly and reliably determined; the constitution forms of DC breaker semiconductor assemblies like a semi-bridge device, a parallel connection device, a series connection device and an individual device can be compatible; the test circuit and the method of the invention are simple and easy, and are strong in operationality.