The electromagnetic induction demonstrator is a portable experimental device designed specifically for middle school and university physics teaching. It can complete intuitive demonstrations of core concepts such as Faraday's law of electromagnetic induction, Lenz's law, eddy current, etc. within 3 minutes. Through replaceable magnets, coils, and data acquisition modules, teachers and students can observe and quantitatively analyze the relationship between induced electromotive force, magnetic flux changes, and coil turns in real time. Teaching scenario: The teacher can carry it with one hand without the need for a darkroom. Group experiment: Top magnetic track quick disassembly design, 4 groups of students can operate synchronously. Remote teaching: Share real-time data to online classrooms through wireless screen mirroring.