Anti-freezing ultrasonic water meter and anti-freezing failure judgment method thereof

The invention discloses an anti-freezing ultrasonic water meter and an anti-freezing failure judgment method thereof. The anti-freezing ultrasonic water meter comprises an ultrasonic water meter body module, an anti-freezing structure module, a detection early warning module and a frost crack water leakage monitoring module. The anti-freezing structure module is installed on a pipe section of the ultrasonic water meter body module and comprises a sleeve, a piston ring, a compression spring and a pipe cover, the sleeve is connected to the pipe section, the piston ring is slidably connected into a pipe cavity of the sleeve, the pipe cover blocks the end, away from the pipe section, of the sleeve, and the compression spring is arranged between the piston ring and the pipe cover; the monitoring and early warning module comprises a temperature sensor I, a temperature sensor II and a pressure sensor; the temperature sensor I is used for measuring the water temperature in the pipe section; the temperature sensor II