In order to thoroughly implement the national digital education strategy and innovate the teaching mode, this study takes the optics course as the practice carrier to systematically explore the teaching auxiliary function of the WeChat official account. Through the longterm teaching practice, the basic framework of teaching resource library of WeChat official account has been constructed. Based on the platform operation data and user research, the key elements of resource construction are analyzed in depth, and an efficient digital learning platform is created. The research shows that the model has achieved remarkable results in promoting the digital transformation of higher education, optimizing teaching methods and improving teaching quality, which provides a practical example for teaching reform and innovation.