An identifiable modular electronic device is provided, which includes a base main body, a plurality of external modules, a rotating ring, a plurality of first magnetic induction modules, a second magnetic induction module and a processing module. The base main body includes a plurality of sockets. Each external module can be plugged into each socket. A slot is disposed at a side of each external module. Each external module includes a first magnetic body. Each first magnetic induction module induces each corresponding first magnetic body to produce a magnetic flux signal. The rotating ring sheathes and is fixed on the base main body. The rotating ring is disposed with a plurality of latches, and one of the latches is disposed with a second magnetic body. The rotating ring is rotated from the OFF position to the ON position.