In view of the characteristics of small- and medium-sized manufacturing enterprises and the status quo of digitalization, it is necessary to develop a more applicable digital transformation maturity model. The decision testing and evaluation laboratory method (DEMATEL) is used to provide the visual impact relationship between digital transformation criteria, and combined with the network analytic hierarchy process (ANP) to determine the mixed weight of indicators, and then fuzzy comprehensive evaluation is used to evaluate the digital maturity of small- and medium-sized manufacturing enterprises. The empirical analysis of small- and medium-sized manufacturing enterprises in Guangdong Province shows that digital strategy and information technology play a key role in the digital transformation of enterprises, and digital process and digital innovation are the main problems faced by small- and medium-sized enterprises. In addition, the digital maturity of enterprises is related to the industrial base, regional policies, industry types, etc. This study provides some guidance for the implementation path selection of small- and medium-sized enterprises’ digital transformation and accelerates the digital transformation and sustainable development of small- and medium-sized manufacturing enterprises.