To provide a magnetic cation exchange material which has good magnetosensitive properties due to its high magnetic body content and can be produced by a safely simple and easy method in order to collect, remove, concentrate, and recover metal ions from industrial effluent, river water, and ground water by using a magnetic separation technique and by using it more simply, safely, efficiently, and repeatedly.

The magnetic cation exchange material can be produced by the safely simple and easy method. The metal ions of industrial effluent, river water, etc., can be collected, removed, concentrated, and recovered simply, safely, and efficiently by using the magnetic cation exchange material and the magnetic separation technique.