Abstract: The present invention discloses a magnetic water heater including a watercourse main body and a water flow switch. The watercourse main body includes a water tank, a water inlet, and a water outlet. The water inlet, water tank and water outlet are sequentially connected with each another by pipelines. The water flow switch is arranged between the water inlet and the water tank. A plurality of magnetic heating fins is arranged in the water tank. The magnetic heating fins and the water flow switch are connected to a control circuit. The magnetic water heater can not only improve the water purifying rate, but also increase the solvency of water, and inhibit growth and breeding of bacillus, thereby dramatically improving the water quality.