Medical beta electron emitting source locating protector

The utility model relates to a medical beta electron emitting source locating protector which is provided with a treatment positioning device in a through pipe shape and a protecting casing in which a column-shaped beta electron emitting source is inserted. The front part and the back end of the positioning device are respectively provided with a treatment window and a beta electron emitting source inlet; after the protecting casing is sheathed coaxially with the positioning device, a key and a key groove which cause the beta electron emitting source to extend out along the axial direction are arranged on the side wall of an outer casing. Precise positioning treatment can be carried out on the lesion position of patients via the apparatus of the utility model, and the irradiation damage to the operators and the normal tissues of patients caused by the beta electron emitting source can be avoided, so that the operation is safe and convenient.