The invention relates to a device suitable for measuring the sound field characteristics of an air-coupled ultrasonic detection transducer, solving the problem of calibrating the sound field characteristics of an air-coupled ultrasonic transducer, and realizing automatic measurement of the focal length, focal length, and focal region width of the transducer sound field And beam spread angle characteristics. The sound field measurement device of the present invention includes: a scanning mechanism, an ultrasonic transceiver and signal collection system, a motion control system, a sound axis alignment mechanism, and a microhole sound barrier. The ultrasonic transceiver mode of the measurement system is the way of sending and receiving, and it is carried out in a closed transparent chamber. During the measurement, the receiving transducer is installed on the fixed bracket, and the measured air-coupled transducer is aligned through the sound axis alignment mechanism. The sound beam axis is adjusted to coincide with the Z axis. The pulsed sound field emitted by the air-coupled ultrasonic transducer is received by the receiving transducer attached with the micro-hole sound shield, and the peak value of the pulse echo signal is calculated by the computer through the data acquisition card, and this voltage peak value is used as the sound pressure of the acoustic signal amplitude. The sound pressure distribution of the spatial sound field of the air-coupled ultrasonic transducer can be measured by the computer driving the ultrasonic transducer through the motion control system to perform spatial scanning movement relative to the receiving aperture.