The invention relates to home decoration floor heating devices, in particular to a water circulation floor heating electromagnetic heater and a descaling device. The water circulation floor heating electromagnetic heater comprises a water tank, a heating body, an electromagnetic coil, a water inlet pipe, a water outlet pipe, a water pump, a descaling mechanism and a scale collecting box. Accordingto the device, by the simple mechanisms, the accumulation and formation of water scale on the heating body are effectively avoided without affecting the heating efficiency, and the problem of cleaning of scale formation on the wall surface of the heating body is solved.