The invention discloses a portable audio-visual feedback device and method for cardio-pulmonary resuscitation. The device comprises an insulation covering blanket, a compressor and an audio-visual feedback device unit; the insulation covering blanket is used for insulating current generated when a defibrillator administers an electric shock; a displacement sensor is installed in the compressor, and is used for measuring external chest compression depth, and transmitting data to the audio-visual feedback device unit; the audio-visual feedback device unit includes a control circuit, a storage module and an output module; and the control circuit is used for receiving the data and comparing the compression depth with a standard threshold value in the storage module, and if the compression depth exceeds the set threshold value, a corresponding adjustment command is given by the output module. According to the device and the method, accurate cardio-pulmonary resuscitation guidance is more efficiently given to rescuers participating in sudden cardiac arrest rescue, and thus, sustained cardio-pulmonary resuscitation is guaranteed, the resuscitation success rate is increased, the life safety of the rescuers is guaranteed, the personal privacy of female patients is protected, and corresponding warm keeping measures are provided for patients in low-temperature weather.