In information age, carrying out network education is the most effective way for universal education and lifelong education. On a macro level, the status of network education development greatly reflects the development level of modern education of a country or a region. This paper introduces the design and implementation of a WebRTC based online video teaching system on android OS. This teaching system brings out an open standard-based, user friendly learning platform that allows audio and video teaching collaboration at any time with participants at anywhere. It will not only effectively drive the development of network education, but also powerfully promote the popularization of continuing education and on-the-job training.