Ultrasonic flowmeter convenient to replace

The utility model provides an ultrasonic flowmeter convenient to replace, and belongs to the technical field of ultrasonic flowmeters. The ultrasonic flowmeter convenient to replace comprises a flowmeter body part and a butt joint assembly. The flowmeter main body part comprises a flowmeter body, a main pipe and two first flanges, the main pipe is arranged at the bottom of the flowmeter body, and the two first flanges are fixed to the two ends of the main pipe respectively; the butt joint assembly comprises a plate, a second flange, a first threaded rod, a second threaded rod, a connecting hose and a limiting block. The second flange, close to the external pipeline, of the butt joint assembly is in butt joint with the flange of the external pipeline, and due to the arrangement of the connecting hose, more degrees of freedom exist between the main pipe and the external pipeline; even if the coaxiality between the main pipe and the external pipeline has a certain deviation, the second flange can be easily butte