Alternating load test circuit of direct-current power supply and portable test box thereof

The utility model discloses an alternating load test circuit of a DC power supply and a portable test box thereof, and the test circuit comprises an oscillation transformer which comprises a transformer primary side and a transformer secondary side; wherein the transformer primary side series loop comprises a first wiring end used for being connected with the positive electrode of a direct-current power supply, a second wiring end used for being connected with the negative electrode of the direct-current power supply, and the oscillation transformer primary side, the current-limiting resistor and the test switch which are connected between the first wiring end and the second wiring end in series; the transformer secondary side series loop comprises the oscillation transformer secondary side and an oscillation capacitor which are connected in series; and the power supply state detection device is connected with the direct-current power supply and is used for testing the real-time state of the direct-current po