The invention discloses an intelligent water meter with a water leakage preventing function. The intelligent water meter comprises a hardware system and a software system, and the hardware system comprises a mixed signal controller, an IC (integrated circuit) card, an IC card interface, a liquid crystal display, an electric-control valve control interface, a water quantity collecting and monitoring component, a driving motor and an acoustic alarming circuit; the software system adopts modular processing and is composed of main control programs and functional sub programs, and the main control programs include system initialization, state judgement, flow pulse and water consumption processing, alarm prompting and low-power-consumption mode processing; the functional sub programs include an interface module of the IC card, a power source detection module, a flow monitoring module, a flow judging module, a time monitoring module, a charging processing module and a valve control module. The intelligent water meter integrates prepayment, gradient water charging, fault detection, the alarming function and the water leakage preventing function.