Provided are a tracing device and a tracing method which relate to the field of medical equipment. The tracing device is used to manifest the marker in the detected subject. It includes a light source and an optical identifier. In the above, the light source is configured to provide a first beam to irradiate the detected subject. And the first beam can interact with the detected subject and then the detected subject generates a second beam different from the first beam. In the above, the optical identifier is configured to detect the second beam so as to identify the marker on the detected subject. The tracing device of the present disclosure is highly sensitive and has simple structure. The tracing method of the present disclosure is easy to implement and can clearly identify markers.
