Method and device for controlling working state of jack

The invention provides a method and a device for controlling the working state of a jack. The method comprises the steps of acquiring the amplitude of a current electrical signal of a controlled jack for an electrical appliance, judging whether the amplitude of the current electrical signal is larger than a preset jack threshold or not, and powering off the controlled jack for the electrical appliance on the condition that the amplitude of the current electrical signal is not larger than the preset jack threshold. According to the embodiments of the invention, the amplitude of the current electrical signal is acquired and compared with the preset jack threshold, so that the working state of the electrical appliance can be judged. When the electrical appliance is in the shutdown state, the jack for the electrical appliance is automatically powered off. Therefore, the power supply of the electrical appliance does not need to be cut off manually. The power consumption problem of the electrical appliance in the shutdown state due to the switching-on state of the power supply can be solved. Meanwhile, the safety is improved at the same time.