Multimedia network technology refers to multimedia network teaching based on text data communication, which can make better use of sports resources in college physical education teaching. Multimedia technology combines computer and video technology. It refers to the combination of two or more sounds and images to form a system that can transmit information. When the initial key changes slightly, the hash bit change rate of the scheme is greater than the threshold value of 0.451, which shows that the hash algorithm in this paper has good key sensitivity. The more sensitive the perceived hash is to the change of the key, the more difficult it is for the attacker to estimate the key, and the better the security of the hash key. Therefore, the above experiments can prove that the hash algorithm in this paper is safe. The appearance of sports network distance education in this paper provides a broader stage for schools and makes greater contributions to the improvement of the overall physical quality of citizens in the whole society.