The invention discloses a vehicle external illumination control circuit and a control method, and a metro vehicle. The vehicle external illumination control circuit comprises a train-level circuit anda home terminal external illumination control circuit. The control logic of the original external illumination control circuit is remained, and control of driver's cab occupation on the external illumination is also added; conditions of home terminal occupation with a forward direction handle and home terminal occupation with a backward direction handle are distinguished, and back up is redefined; and in the back up process of a train, headlamps at the two ends are both turned on to ensure safety distance between front and back vehicles in the back up process of the train.