Method and device for outputting signals based on I/O interface

The embodiment of the invention discloses a method and device for outputting signals based on an I/O interface. The method and device are used for the improvement in the stability performance of a chip product. The I/O interface is arranged in a first chip and the first chip is provided with a Core power source domain and is in communication connection with a second chip. The method comprises the steps that whether the voltage output by the Core power source domain is lower than the preset threshold voltage of the first chip or not is judged; if the voltage output by the Core power source domain is lower than the preset threshold voltage, a first level signal is generated according to the control function conducted by the first chip on the second chip, and the first level signal is used for enabling the second chip to be in the ignoring state after the second chip receives the first level signal; the first level signal is sent to the second chip through the I/O interface, wherein when the second chip is in the ignoring state, a control signal and a data signal which are sent by the first chip are ignored by the second chip.