Disclosed are an artificial intelligence-based method and device for voiceprint authentication. The method comprises receiving a registration request of a user and providing a registration string to the user; receiving voice information of the user reading the registration string and producing N segments of voice on the basis of the voice information, where N is a positive integer; determining a gender tag of the user on the basis of a gender classification model and the N segments of voice; and producing a registration voiceprint model for the user on the basis of the gender tag and the N segments of voice.