The invention discloses an ultrasonic detection imaging method. The method includes the following steps that first, a stepping motor drives a foldable multi-stage rotating ultrasonic probe, an ultrasonic probe body of the foldable multi-stage rotating ultrasonic probe transmits an ultrasonic signal, and an ultrasonic echo detection signal is collected and transmitted to a detection host; second, a signal processing module positions and calculates the position of the ultrasonic probe body, and position information is transmitted to the detection host; third, the ultrasonic echo detection signal picked by the detection host is imaged through the detection host, image splicing is performed according to the position information, and an image of a detected target is obtained; fourth, an image display displays the image. The invention further discloses a device for implementing the ultrasonic detection imaging method. The device comprises a sucker, the image display, the detection host, a power module, a signal processing module and the foldable multi-stage rotating ultrasonic probe. The device has the advantages of being simple in structure, easy to operate, convenient to control, high in accuracy and the like.