Power supply controller for rat-repelling device for automobile

The utility model discloses a power supply controller for a rat-repelling device for an automobile. The power supply controller comprises a current sensor, a voltage comparator, a first switch, a second switch and a relay, wherein the current sensor is installed on a current output line of a generator of the automobile; the voltage comparator is connected with the current sensor and the first switch, and the first switch is controlled by the voltage comparator to be turned on or turned off; the second switch is connected with the first switch and controlled by the first switch to be turned on or off; a storage battery of the automobile is connected with the relay through the second switch, the relay is controlled through the second switch, and accordingly an outage/discharge state of the storage battery is controlled. According to the power supply controller, the current sensor is installed and clamped on the current output line of the generator of the automobile to serve as distinguishing signals for judging whether an engine works, the automatic on-off control of the rat-repelling device is achieved on the conditions of no modification of an original automobile line, and a high voltage wire of an ignition system does not need to be clamped.