Water volume alarm device

The invention relates to a water volume alarm device which belongs to the field of daily life. The water volume alarm device comprises a piston body (1), and is characterized in that the piston body (1) is circular, and the middle part thereof is provided with a round piston core (2); the inner bottom of the piston body (1) is provided with a circular conductor ring (3), and both sides in the piston rod (1) are respectively provided with a magnet (4); the piston core (2) is arranged below the magnets (4); both sides of the piston core (2) ,which correspond to the magnets (4), are respectively provided with a briquette (5); the center of the round piston core (2) is provided with a hollow section in which a power supply (6) and a sounder (7) are arranged; and the power supply (6) and the sounder (7) and the two briquettes (5) are respectively connected electrically. The water volume alarm device has simple structure, is convenient to be manufactured, not only can give alarm in time before the water overflows b