The invention discloses an earth-leakage protective equipment for electric water heaters, which comprises a shell provided with a water inlet and a water outlet, and an electro-filtration body arranged in the shell, wherein the electro-filtration body connects to zero line. Despite the heater switch of the water heater is on or off, and regardless of the earth leakage due to overtime using of the water heater, the electricity in water of the water heater can be filtered without causing personal injury, thereby resolving the problem of earth leakage of water heaters fundamentally.