The invention discloses a digital image interface and a method for realizing data transmission between an ultrasonic device and an image workstation. The digital image interface comprises an interface control module, a data transmitting and receiving unit, and an interface memory; the data transmitting and receiving unit is in communication link with the image workstation and the interface control module separately, and is used for achieving serial/parallel conversion and transmission of data; the interface control module is connected with the ultrasonic device, and is used for receiving and responding to an order from the image workstation; and data required by the image workstation is acquired from the ultrasonic device, then cached in the interface memory and at the same time sent by the data transmitting and receiving unit back to the image workstation. The invention achieves the effects of realizing the bidirectional full-digital transmission of data between the ultrasonic deviceand the image workstation and guaranteeing the qualities of images. Meanwhile, due to the invention, the image workstation is capable of acquiring necessary data from an image device according to self demands, instead of passively receiving image device data, thereby facilitating further processing by the digital image workstation terminal.