1. A method for changing lip shape in a voice-driven animation, comprising: obtaining audio signals, and obtaining motion extent proportion of lip shape according to characteristics of the audio signals; obtaining an original lip shape model inputted by a user, and generating a motion extent value of the lip shape according to the original lip shape model and the obtained motion extent proportion of the lip shape; and generating a lip shape grid model set according to the generated motion extent value of the lip shape and a preconfigured lip pronunciation model library.