The invention discloses a radio-frequency-technique-based self-power-generating intelligent water meter which comprises a power supply module, at least two water quantity detection modules and a control
alarm device, wherein the power supply module is connected with the control
alarm device, and both the power supply module and the control
alarm device are arranged in the shell; the water quantity detection modules are connected with the control alarm device, and embedded in the shell on the lower side of the control alarm device; a water inlet of each
water quality detection module is connected with a user water main
pipe port arranged on the shell through a
branch pipeline; the control alarm device comprises a processor, and a
liquid crystal display module, a radio-frequency receiving module, a heater and an
ultraviolet sterilizer which are connected with the processor; the power supply module comprises a hydroelectric generator and a battery; and each water quantity detection module comprises a mechanical water meter and a dry reed
pipe. The invention implements water quantity detection and electronic display on the basis of the original mechanical water meter, implements
centralized management on a plurality of water meters, has the functions of self power generation and alarming, implements the functions of meter reading and water quantity recharging in combination with the radio-frequency technique, has the functions of
water heating and disinfection, and is convenient for people to use.