Bronchus endoscope

The utility model relates to a bronchus endoscope which comprises a three-way pipe fitting, an endoscope outer pipe, an endoscope inner pipe, an eyepiece sleeve, an eyepiece shell and an objective lens system, a connecting seat is arranged in the three-way pipe fitting, an eyepiece sleeve is arranged in the eyepiece sleeve, and a diaphragm is arranged in the eyepiece sleeve. A first light guide connector, a second light guide connector, a third light guide connector and a light guide connecting sleeve which are connected with the three-way pipe in a clamped mode are arranged on the lower portion of the three-way pipe, the objective lens system comprises a second lens, a third lens, a fourth lens and a plurality of rod lens sets, and a first spring ring is arranged between the second lens and the third lens. A second spring ring is arranged between the fourth lens and the nearest rod lens group, each rod lens group comprises a first rod lens and a second rod lens which are connected, a fourth spring ring is ar