A sunrise/sunset power supply time control system comprises an application program and a power supply controller, wherein the application program is installed on an electronic device comprising a near field communication transmission unit, and the power supply controller is electrically connected to a power gird end and at least a load end, in which the application program can acquire the coordinate values and the current time at which the electronic device is presently located and calculate a sunrise/sunset timetable to which the coordinate values correspond, and then transfer the current time and the sunrise/sunset timetable to the power supply controller via the near field communication transmission unit, while subsequently the power supply controller controls the power supply time in accordance with the received current time as well as the sunrise/sunset time recorded in the sunrise/sunset timetable.