The invention relates to the technical field of ultrasonic imaging equipment, and in particular, relates to an ultrasonic transducer scanning system. The ultrasonic transducer scanning system comprises a mechanical arm, a storage unit, a path generating unit and a control device. The tail end of the mechanical arm is equipped with an ultrasonic transducer, so that the ultrasonic transducer can move and scan on the surface of target parts, which needs to be inspected, of an inspecting object. The storage unit stores reference cross-section images corresponding to different target parts. The path generating unit generates moving path information according to the initial cross-section images collected by the ultrasonic transducer and the reference cross-section images; the control device controls the mechanical arm and the ultrasonic transducer to do motion scanning to obtain target cross-section images according to the moving path information. The invention also provides a scanning method and an ultrasonic imaging device, for example, when mammary gland examination is performed, a transducer module is moved onto patient breasts for scanning through a support arm. The ultrasonic transducer scanning system can automatically obtain the target cross-section images of the target parts which needs to be inspected, has high degree of automation, and greatly improves the imaging efficiency.