In order to expand the concept and form of teacher training, a remote human-computer interaction and STEM teacher online training platform based on the embedded Internet of Things is proposed. Based on the content analysis method, this article sorts out the development status of the current online teacher training platform and points out the shortcomings of the platform in information aggregation, resource construction, content setting, presentation, learning support services, and other aspects. Based on the combination of new concepts and new technologies, an online training platform for STEM teachers is proposed for the construction of the platform from four perspectives: innovative design concepts, enriching platform promotion ideas, developing educational makers, and improving support services, and the results of the use are investigated. The results show that the subjects believe that the STEM teacher online training system has clarified the STEM curriculum design steps, standardized STEM design methods, improved their cooperative learning ability, and cultivated design thinking. Among them, 13 people think that the training system has made STEM design steps clearer, “the design process is clearer,” “it makes me clearer about the whole design process,” and “the course design and development process is clearer.” Conclusion. This platform can provide a reference for online training and professional development of Chinese teachers.