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This utility model relates to an ultrasonic smart gas meter vibration detection circuit. Its features include a vibration detection circuit employing an electromagnetically inductive omnidirectional vibration sensor to convert vibration amplitude into an electrical signal; an operational amplifier processing circuit including a filter circuit, a decoupling circuit, and an operational amplifier to amplify and filter the weak signal output by the omnidirectional vibration sensor; an output signal control circuit that raises the bias voltage of the operational amplifier through a resistor voltage divider to ensure that the weak signal can activate the transistor in the output signal determination circuit; and an output signal determination circuit that converts the analog signal into a digital level signal using the switching characteristics of the transistor to determine whether vibration has occurred. This utility model, using an electromagnetically inductive vibration sensor and signal processing circuit, combined with filtering, decoupling, and operational amplifiers, can accurately capture weak vibration signals from the gas meter and its surrounding environment, ensuring the detection of minute vibration changes, exhibiting high sensitivity, and enabling timely response to vibration signals.