Visual rectal tumor insection edge positioning device

The invention relates to a visual rectal tumor undercut edge positioning device. The guide pipe is used for positioning the tumor insection edge, and the inner core penetrates through the inner side of the guide pipe in a sliding mode. The front end of the inner core is provided with a camera unit, the front end of the guide tube is provided with a starting part used for abutting against the insection edge of a tumor, a scale area is arranged between the guide tube and the inner core and used for displaying the linear sliding distance of the inner core relative to the starting part, and the guide tube or the inner core is provided with a marking mechanism used for assisting in marking the rectum. The method has the advantages that a doctor can clearly quantify the excision range in an operation, difference caused by personal judgment is avoided, and the situation of excessive excision or insufficient excision is avoided. Specifically, an operator can directly judge the position of the undercut edge in the rec