A software and hardware experimental platform has been designed, which organically integrates automatic judgement and sensing communications with electro-mechanical integrated IoT measurement and control. And a teaching system of cross-grade experimental course group based on this platform has been proposed, which is driven by the application function topics. It is an engineering ability training mechanism that can continuously carry out experimental teaching from the lower grade to the higher grade. More than five years of teaching practice shows that this system has significantly improved the students\' professional research interest and ability to solve complex engineering problems.