The invention relates to a direct current output switch circuit, comprising a bus and an output interface in connection with a battery, and also comprising a direct current relay, an anti-reverse diode, a first relay, a second relay, a voltage detector and a master control device. The direct current relay is arranged at the input terminal of the bus; the positive electrode of the anti-reverse diode is in connection with the positive electrode of the bus, and the negative electrode is in connection with one end of a normally open point of the first relay; the other end of the normally open point of the first relay is in connection with the positive electrode of the output interface; one end of a normally open point of a second relay is in connection with the negative electrode of the bus, and the other end of the normally open point is in connection with the negative electrode of the output interface; the voltage detector is in parallel connection between the positive electrode and negative electrode of the output interface; the master control device is in connection with the direct current relay, the first relay, the second relay and the voltage detector. Compared with the prior art, the direct current output switch circuit has the advantages of high safety and stability, great controllability, low cost, wide applicability, etc., and is suitable for connecting with a bus having the rated current of 30 A and direct voltage of 1300V.