Pipeline flowmeter

The invention relates to a pipeline flowmeter which comprises a rotating device arranged in a water outlet pipe, a movable plate is connected to the movable end of the rotating device, and the rotating device further comprises a shell; a rotating rod; a plurality of springs; aflexible film which is arranged on the inner wall of the shell in a spaced mode, whereina notch is formed in the flexible film; arotary support which comprises an upper supportand a lower supportwhich are fixedly connected together, whereinthe lower support extends to the outer side of the shell from the opening, the lower support is fixedly connected with the movable plate, the top end of the upper support extends into a gap between the flexible film and the shell from the notch, and the upper support is a rotating face with the circle center consistent with the circle center of the cross section of the shell; and an angle sensor which is fixedly connected to the outer side of the water outlet pipe, whereina rotating shaft of the angle