The diffusion degree of traditional music in music teaching is analyzed by constructing an information diffusion model based on traditional music knowledge. Combine the information flow window to analyze the path process of integrating traditional music culture and music teaching. Combine the kernel function to calculate the degree of similarity between traditional music culture and music teaching. Analyze the students’ preference for traditional music culture content in music teaching by calculating the traditional music theme preference value. The results show that music teaching that incorporates traditional music culture has a better diffusion effect on teaching content, teaching method and teaching form, with the diffusion degree in the interval of [0.45, 0.85), and the diffusion degree interval of teaching information that does not incorporate traditional music culture is in the interval of [0.25,0.35). This study contributes to the integration of traditional music culture and music teaching to a certain extent and enhances the effect of music teaching in colleges and universities.