The invention provides an amphibious key based on an electromagnetic induction principle. The amphibious key comprises a permanent magnet sheet stress column, a permanent magnet sheet, a permanent magnet sheet cover plate, an arc-shaped sliding groove, an upper nut, an upper gasket, a winding magnetic core column, a cylindrical permanent magnet, an induction coil, a permanent magnet coil bin and asignal contact point. The opposite surfaces of the permanent magnet sheet and the cylindrical permanent magnet are the same in magnetic polarity, the permanent magnet sheet and the permanent magnet sheet are in a suspension state due to the repulsion effect between the cylindrical permanent magnet and the permanent magnet sheet, and the repulsion effect between the same poles is restored to the original state after the key is pressed down; four operations of pressing, bouncing, long pressing and short pressing of the key can be judged by utilizing the positive and negative polarities of the key output signal and the conversion time interval between the positive and negative polarities; certain gaps are reserved among the three groove-shaped connecting pieces, when the key is pressed down,water in the arc-shaped sliding grooves is discharged from the gaps, and it is guaranteed that the inner water pressure and the outer water pressure are consistent. Therefore, the sensitivity of thedevice is irrelevant to the underwater depth of the key, and the device can adapt to a deep water environment.