Ultrasonic water meter

The utility model discloses an ultrasonic water meter and a meter head device thereof. The meter head device comprises a meter shell, a battery module, a flow integrating module used for flow calculation and a remote transmission module are arranged in the meter shell, the flow integrating module comprises two ultrasonic transducers, and the two ultrasonic transducers are installed on the two sides of a measuring straight pipe of the ultrasonic water meter. The remote meter reading system has the beneficial effects that a remote meter reading function is realized by adopting a remote transmission communication technology; the flow totalizer has a bidirectional metering function. The ultrasonic water meter can well reduce measurement errors and is simple in structure. Due to the fact that the space above the ultrasonic water meter cover is insufficient in the actual installation process, the meter cover is difficult to open in an up-down overturning mode, the meter cover can be opened around the thin-head scre