With the vigorous development of the Internet, a large number of IoT devices had been available in our daily life. This article explains the history and origin of the IoT, and points out why the IoT is so important in manufacturing industry. The role of IoT in Industry 4.0 is introduced first, the development of Industry 4.0 and the application and future trend of IoT are then explained. Current technology development priorities and future trends of domestic manufacturing industry based on Internet of Things are also illustrated in this article.