This study examines the impact of the use of CGI digital technology on the sustainability of animated films. The study shows that because of the powerful virtual capabilities of CGI digital technology, CGI animated films that use CGI digital technology have a huge box office advantage over non-CGI animated films that do not use CGI digital technology, greatly increasing the profitability of animated films and expanding the scope for their sustainability. This study found that CGI digital technology enables animated films to achieve the same visual realism as live-action films, breaking down the barriers to viewing traditional animation and greatly enhancing the competitiveness of animated films. These results show that CGI digital technology has had a profound positive impact on the sustainable development of animation.