The invention provides an electric water heater capable of detecting leakage. The electric water heater comprises a controller, an electric heating device and a water tank. The electric heating device is disposed in the water tank. The electric heating device comprises a left pipe box, a right pipe box and heat exchange pipes which make the left pipe box communicate with the right pipe box, electric heaters are disposed in the left pipe box and/or the right pipe box, and the heat exchange pipes, the left pipe box and the right pipe box form a heated fluid closed cycle; the electric heating device is further provided with a pressure sensor which is used for detecting pressure inside the electric heating device; the electric heating device and the pressure sensor are in data connection with the controller, and the controller automatically controls operation of the electric water heater according to detected pressure; and the controller is connected with a cloud server, the cloud server is connected with a water heater client, the controller transmits measured pressure data to the cloud server, then the pressure data are transmitted to the client through the cloud server, the client is a mobile phone, an APP program is installed in the mobile phone, and a user can obtain the pressure data through the client. The electric water heater can intelligently detect leakage of the heating device of the water heater and conduct intelligent control, and therefore, the safety is improved.