结合产业集群与企业成长理论，探析产业集群支持对中小制造企业专精特新发展的影响机制，并以浙江省中小制造企业为样本进行实证检验。研究表明，产业集群支持可以促进中小制造企业提升专精特新发展水平，但产业集群支持的作用强弱会受到企业内外部因素的影响。具体而言，当中小制造企业面临较高的“卡脖子”挑战时，产业集群支持的促进作用更为突出；而当中小制造企业的数字化建设水平较高或客户等级较高时，产业集群支持的促进作用则相对减弱。

This paper combines knowledge from industrial clusters and enterprise growth theories to analyze the mechanism through which industrial cluster support affects the development of specialization, refinement, differentiation, and innovation (SRDI) among manufacturing SMEs and employs a sample of manufacturing SMEs in Zhejiang Province for empirical analysis. The findings indicate that industrial cluster support can effectively enhance the SRDI development level of manufacturing SMEs; however, the strength of industrial cluster support is moderated by both internal and external factors of the enterprises. Specifically, when manufacturing SMEs face severe “bottleneck” challenges, the supportive effect of industrial cluster support is more pronounced, whereas this supportive effect diminishes when manufacturing SMEs have higher levels of digital construction or cater to higher-level clients.