Integrated water meter used in Internet of Things and integrating water purchasing setting and water metering

The invention discloses an integrated water meter used in the Internet of Things and integrating water purchasing setting and water metering. The water meter comprises a water buying character wheel set used for displaying the water buying amount, a numerical value setting assembly, a valve assembly arranged on a water meter water outlet leading to a water pipeline of a user in an opening or closing mode, a touch valve closing assembly used when the numerical value of the water buying character wheel set returns to zero, a secret key assembly which is used for opening the numerical value setting assembly and the valve assembly according to a starting password configured by a water affair management center for a target water meter, and a reverse counting gear which is used for synchronously driving character wheels in the water purchasing character wheel group to reversely rotate according to the water consumption of the target water meter. According to the water meter, not only is the phenomenon of irregulari