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This utility model relates to the field of medical device technology, specifically to a coil device and a medical device. The coil device includes multiple stacked and spaced-apart coil assemblies. Each coil assembly includes an insulating support plate and at least one helical coil wound from the center outwards. The helical coil is attached to the outer surface of the insulating support plate. At opposite ends of the insulating support plate in a first direction, the insulating support plates of adjacent coil assemblies are connected by a support assembly to create a gap between the two coil assemblies. The helical coils of the multiple coil assemblies are connected in parallel. The coil device of this application can superimpose the magnetic fields of multiple coil assemblies, thereby increasing the overall magnetic field strength of the coil device compared to existing coil devices, meeting the needs of scenarios with higher magnetic field strength.