IC card intellectual household water meter, a calculative instrument with a prepaid function, is composed of the water meter with signaling equipment, electronic controller, power-driven ball valve, and IC card which bears the role of medium. It automatically switches on and off the valve according the credit; It is of high anti-interference, reliability and accuracy. Features and functions: 1) Automatically switch on and off valve: once the credit turns to zero, it would automatically switch off valve; and once recharged, recovers 2) When the credit reaches the limited, it would alarm to remind user of recharging 3) Accurate calculation 4) Integrated design, smart size, easy to install 5) Data reservation of 10 years 6) Multi-protection