<p>Against the background of carbon neutrality and sustainable manufacturing, manufacturing faces multiple challenges in improving carbon emission efficiency, with the integration of digital technology and industrial internet platforms as a key solution. Given the digital technology availability, this study focuses on the internal mechanism and dynamic decision-making issues of how the industrial internet platform can enhance the manufacturing carbon emission efficiency. This study has constructed a differential game model involving manufacturing enterprises, the government, and industrial internet platforms. This study incorporates random interfering factors. This method addresses the limitations of neglected external uncertainties and overly loose assumptions. The innovation enables the capture of stochastic disturbances in carbon emission systems, such as market fluctuations and policy adjustments. The realism of matching equilibrium strategies to the enhancement of manufacturing carbon emission efficiency is improved. The findings are as follows: (1) Carbon emission system benefit coefficient, operational cost coefficient, and compliance cost coefficient negatively impact game strategies, while digital technology maturity coefficient has a positive effect; (2) Government subsidies under intermediate dependence enhance the effort of enterprises and platforms, and advanced symbiosis achieves optimal effort of the three subjects and system efficiency through in-depth digital technology availability empowerment; (3) The advanced symbiotic decision-making mechanism model is regarded as the optimal embodiment and practical application of the digital technology availability theory. Reasonable benefit distribution can fully unleash the potential value of digital technology availability.</p>