Provided by the present invention are a signal interference apparatus and method, the apparatus comprising: a receiving link, used for receiving an air signal, converting the air signal into a digital signal, and sending the digital signal to a programmable interference source module; the programmable interference source module, used for performing de-synchronization processing on the digital signal, generating a transmission modulation signal according to a de-synchronization processing result, and sending the transmission modulation signal to a transmission link; and the transmission link, used for receiving the transmission modulation signal, converting the transmission modulation signal into a modulation interference signal, and radiating the modulation interference signal into the air. The present invention solves the problem wherein an existing terminal signal interference device has a high power requirement and consumes a lot of power, thus making it impossible to completely interrupt terminal communication.