The invention relates to the medical instrument technical field, which is the external casing of a
capsule endoscope esophagus inspection auxiliary. The external casing consists of two parts of a double-cavity
pipe (1) and a mouth
gasket (2), the double-cavity
pipe is a slender
pipe, the one is the wire-draw pipe cavity of the
capsule endoscope esophagus inspection auxiliary, the other one is a
biopsy forceps pipe cavity, one end of the double-cavity pipe is bent presenting an arc shape and being connected with the mouth
gasket; the mouth
gasket is coarse and short, and is integrated with the double-cavity pipe as a whole, two pipe cavities of the double-cavity pipe penetrate the mouth gasket, a pipe mouth (23) is arranged at the liberation end of the mouth gasket, a
ring type edge (21) is arranged at one end of the mouth gasket adjacent to the double-cavity pipe, and a mouth gasket cover (22) is arranged at the liberation end. The structure of the invention is simple, the operation is convenient, a
throat mucous membrane or an
esophagus mucous membrane safe from a wire-draw frictional damage of the auxiliary is effectively protected during the process of performing the
capsule endoscope esophagus inspection, and the
biopsy forceps can be inserted to acquaint a living tissue, thereby ensuring that the
biopsy changes easy, and the pain of a patient is lightened.