The invention discloses an offline face recognition system and an offline face recognition method based on low-power-consumption embedded and infrared triggering. The offline face recognition method comprises the steps of continuously detecting an object distance, and returning the object distance by means of a voltage value manner; determining whether an object enters a recognition range according to the returned voltage value, acquiring an image of the image which enters the recognition range, determining whether the acquired image is a face image, if not, displaying error information, and if yes, determining whether the current face image belongs to a moving object, if not, displaying the error information; and if yes, performing matching on the face image and stored information in a face characteristic database, and outputting a matching result. The offline face recognition system and the offline face recognition method have advantages of ultralow power consumption, high mute stability, small size, high convenience in mounting, offline recognition, normal operation without networking, high stability and high reliability in operation.