Touching-type water saving device based on constant current circuit

The invention discloses a touching-type water saving device based on a constant current circuit, comprising a tap (1), a sensor, a relay K1, a relay K2, a controller circuit, a solenoid valve (2) arranged on a tap (1) pipeline, a touch switch-on contact (3) and a touch switch-off contact (4) which are arranged on two sides of the tap and are connected to the control circuit, a voltage transformation circuit which is connected to the solenoid valve (2) and the control circuit and an power amplification circuit which is in serially connected to between the control circuit and the relay K2. The relay K1 is serially connected to between the control circuit and the power amplification circuit, the voltage transformation circuit is connected to the power amplification circuit, and the sensor is serially connected to between the control circuit and the power amplification circuit. The touching-type water saving device based on the constant current circuit is characterized in that a constant current circuit is serially connected between the voltage transformation circuit and the power amplification circuit. The touching-type water saving device based on a constant current circuit can secure the constant working current when the fluctuation happens in the power grid and can prevent the damage caused by the large current.