Abstract: To explore the impact and mechanism of the digital economy on the innovative development of manufacturing enterprises, empirical tests were conducted using Chinese urban data and micro data of manufacturing enterprises from 2011 to 2020. The findings demonstrate that the development of the digital economy has significantly improved the productivity of manufacturing enterprises, becoming a new driving force for innovative development in the manufacturing industry. This conclusion is significantly supported by endogeneity testing. The impact mechanism indicates that the development of the digital economy enhances the total factor productivity of manufacturing enterprises by improving resource allocation and promoting technological innovation. The threshold model and spatial model tests indicate that the digital economy has a significant non-linear feature of increasing marginal effects and spatial spillover effects on the productivity improvement of the manufacturing industry. Heterogeneity analysis shows that the digital economy has a significant impact on improving productivity in the eastern region, digital economy industries, and state-owned enterprises. Adopting a micro perspective of enterprises, this paper deepens the understanding of how urban digital economy promotes innovative development in manufacturing, providing empirical evidence on digital economy-enabled industrial innovative while offering theoretical references for formulating digital economy development strategies and manufacturing industry policies.

Key words: digital economy, total factor productivity, innovative development, nonlinear characteristics, spatial spillover effects

摘要： 为探究数字经济对制造业企业创新发展的影响机制，基于2011~2020年中国城市层面数据与制造业企业微观数据展开实证检验。研究结果表明：数字经济发展显著提升了制造业企业全要素生产率，该结论在经过内生性检验后依然稳健，证实数字经济是推动制造业创新发展的新动能；机制分析显示，数字经济主要通过提升资源配置效率和增强技术创新能力两条路径促进制造业企业全要素生产率的增长；门槛模型与空间模型检验发现，数字经济对制造业生产率的提升效应呈现显著的“边际效应”递增非线性特征，并具有明显的空间溢出效应；异质性分析揭示，数字经济对东部地区、数字经济相关产业以及国有企业的生产率提升作用更为突出。本研究从企业微观视角深化了对城市数字经济促进制造业创新发展内在机理的认知，不仅为理解数字经济与实体经济创新发展的关系提供了经验证据，也为数字经济发展战略与制造业产业政策的制定提供了理论参考。

关键词: 数字经济, 全要素生产率, 创新发展, 非线性特征, 空间溢出效应