The invention relates to an ultrasonic wave flow rate metering device, which comprises a measuring
pipe body and a
signal processing device. The ultrasonic wave flow rate metering device is characterized in that a lug boss sealing body matched with a pipeline
flange of fluid to be measured is arranged at each of two ends of the measuring
pipe body; paired ultrasonic
transducer installing holes are formed in the inner side of the measuring
pipe body. The ultrasonic
transducer installing holes are formed in the inner side of the measuring pipe body, and extend into spaces of the lug boss sealing bodies; the forming positions of the ultrasonic
transducer installing holes meet the requirements that the measuring signals of two ultrasonic transducers can realize the direct
irradiation; the measuring signals of the ultrasonic transducers are introduced into a
signal processing device through a
signal wire. The total length of the ultrasonic wave flow rate metering device is smaller than the length of the conventional pipe section type flow rate metering device; the clamping installation is convenient to realize. The two sides of the ultrasonic wave flow rate metering device are connected with a
water supply pipe through flanges; then, the
signal processing device is positioned in a space formed by the
water pipe flanges positioned at the two sides and the measuring pipe body; the position is hidden; the protection on the
signal processing device is facilitated. A battery cabin and a main board cabin of the
signal processing device use separated design, so that the maintenance is convenient.