An automatic water supply device, wherein the device comprises a water vessel, a bracket for placing the water vessel, a detection device, and a water supply mechanism for supplying water to the water vessel, the water vessel comprising a water filling port; the detection device comprises a sensing unit and a switch movably connected to the bracket, and the sensing unit comprises a sensor fitted with the switch and an inductive element disposed in the water vessel and being capable of rising or falling along with a liquid level; the water supply mechanism comprises a water supply pipe and a water valve provided on the water supply pipe, and an outlet of the water supply pipe corresponds to the water filling port of the water vessel; the automatic water supply device further comprises a controller, the sensor switches between an ON state and an OFF state based on the movement of the switch, and the water vessel is placed on the bracket to touch the switch, thereby driving the sensor to be in the ON state; the sensor detects a position of the inductive element in the ON state to output a detection signal indicating the liquid level in the water vessel; the controller controls the water valve to open or close according to the detection signal received from the sensor; characterized in that the switch comprises a rotating member rotatably connected to the bracket, an electrical connection member is provided on the bracket, and the sensor is provided in the rotating member; when the switch is pressed, the sensor contacts the electrical connection member; the sensor comprises at least three contacts; when the switch is pressed, all of the at least three contacts are in contact with the electrical connection member; the at least three contacts comprise at least two electrical connection contacts and at least one signal connection contact. the detection device comprises a sensing unit and a switch movably connected to the bracket, and the sensing unit comprises a sensor fitted with the switch and an inductive element disposed in the water vessel and being capable of rising or falling along with a liquid level; the water supply mechanism comprises a water supply pipe and a water valve provided on the water supply pipe, and an outlet of the water supply pipe corresponds to the water filling port of the water vessel; the automatic water supply device further comprises a controller, the sensor switches between an ON state and an OFF state based on the movement of the switch, and the water vessel is placed on the bracket to touch the switch, thereby driving the sensor to be in the ON state; the sensor detects a position of the inductive element in the ON state to output a detection signal indicating the liquid level in the water vessel; the controller controls the water valve to open or close according to the detection signal received from the sensor; characterized in that the switch comprises a rotating member rotatably connected to the bracket, an electrical connection member is provided on the bracket, and the sensor is provided in the rotating member; when the switch is pressed, the sensor contacts the electrical connection member; the sensor comprises at least three contacts; when the switch is pressed, all of the at least three contacts are in contact with the electrical connection member; the at least three contacts comprise at least two electrical connection contacts and at least one signal connection contact.