The invention discloses an ultrasonic ship collision avoidance distance measuring circuit. The ultrasonic ship collision avoidance distance measuring circuit includes an ultrasonic wave sensor, a control module, an LED-display digital tube distance display module and a buzzer; the ultrasonic wave sensor detects distance signals and transmits the distance signals to the control module; the control module controls the working states of the LED-display digital tube distance display module and the buzzer according to received signals; and the ultrasonic wave sensor includes an ultrasonic signal transmitting circuit and an ultrasonic receiving circuit. According to the ultrasonic ship collision avoidance distance measuring circuit of the invention, a distance between a ship and an obstacle is measured through the distance measuring sensor and is displayed through a digital tube; the distance measuring sensor measures the interval distances between the ship and the obstacle at two time points with a certain time interval, and therefore, the speed of the approaching of the ship to the obstacle is calculated; a safety distance is determined through using the approaching speed; and the distance between the ship and the obstacle is smaller than the safety distance, the buzzer for performing early warning for the ship emits sound. The ultrasonic ship collision avoidance distance measuring circuit of the invention has the advantages of high precision and convenient use.