The invention provides a double-channel ultrasonic water meter and a working method thereof, and relates to the technical field of flow monitoring, and the double-channel ultrasonic water meter comprises a first
pipe section, a second
pipe section, a base, a fixed pressing plate, a reflecting plate, a reflecting lens, an ultrasonic
transducer, a temperature probe, a control panel battery, an electronic dial plate battery, an electronic dial plate, a control panel, an arithmetic unit, an NB-IoT unit, a
control unit and a supporting plate. When the water meter is used, feed water enters the water meter from an inlet of the first
pipe section, return water enters the water meter from an inlet of the second pipe section, the arithmetic unit calculates a flow difference value of the first pipe section and the second pipe section and transmits the flow difference value to the NB-IoT unit, the NB-IoT unit transmits a flow
signal of the water meter to the control center, and the control center calculates water fees through the charging
system. Two-channel metering is achieved through one water meter, direct drinking water is circulated through the
branch pipes, it is guaranteed that water is fresh, and
investment cost is reduced. And meanwhile, the
water temperature detected by the temperature probe corrects the
water quality index TDS, so that the accuracy of the TDS measured value is ensured.