Provided are a high voltage distribution box (10) for use in an electric vehicle, an electrical control system comprising the high voltage distribution box, and an electric vehicle comprising the electrical control system. The high voltage distribution box (10) for use in an electric vehicle comprises: a direct current positive bus (DC+); a direct current negative bus (DC-); an external direct current charging port (P110) coupled to the direct current positive bus (DC+) and the direct current negative bus (DC-) by means of a pair of relays (S1, S2); multiple output ports (P121-P126) coupled to the direct current positive bus (DC+) and the direct current negative bus (DC-); and a monitoring unit (130) coupled between the relays (S1, S2) and the external direct current charging port and used to monitor a power supply state of an external direct current power supply (2).
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