An ultrasonic sediment-removing vibration unit in a small irrigation ditch flow measuring device, which relates to the technical field of ultrasonic waves and comprises a sealed box (1), a metal cover plate (2), and a circuit board; the sealed box (1) is provided with a top opening; the metal cover plate (2) covers the top opening of the sealed box (1); a signal interface circuit (3), a power supply module (6), a delay circuit (4), a PWM control chip (5), a MOS tube circuit (8), an electrical leakage protection chip (7), a transformer circuit (9), a matching circuit (10), and an ultrasonic transducer (11) are provided on the circuit board. The present invention solves the technical problem of an ultrasonic sediment-removing vibration unit that is applied to a small irrigation ditch flow measuring device. A vibration dredging apparatus suitable for a small irrigation ditch flow measuring device is produced, the efficiency of an automatic sediment removing system of the small irrigation ditch flow measuring device is fully utilized, a power ultrasonic transducer is used for producing ultrasonic waves, and conduction and vibration are carried out by means of a metal bottom plate, such that sediment attached on the bottom plate is not easily deposited, hardened, and solidified, and is easily washed and removed by channel water flow and washing piping.
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