Tracheal diverticula occur mainly in the weak muscular layer of the trachea, resulting in the formation of irregular, sac-like air-containing cavities, and can be categorized as congenital, acquired extrusion, or acquired traction. Tracheal diverticulum is a benign cystic lesion that occurs in the trachea and may result from a variety of causes. For example, congenital factors, i.e., abnormal and weak localized tracheal development, incomplete development of the bronchus during embryonic life, and the presence of congenital malformations such as bronchial cysts. Disease factors, such as emphysema, chronic obstructive pulmonary disease, localized lymphadenitis, etc.; family history of tracheal diverticulum, preterm infants with tracheal dysplasia. The occurrence of bronchial diverticulum is related to the localization of tracheal muscular weakness, which can occur in the muscular weakness of the posterior wall of the trachea, tracheal cartilage and other parts of the trachea, the tracheal mucosa protrudes outward and then forms an irregular or cystic air-containing cavity. Congenital is mainly related to the congenital developmental abnormality of trachea; acquired extrusion is related to chronic cough, emphysema, etc.; acquired traction is related to the adhesion and pulling of local inflammation. It is recommended that the relevant people should consult the doctor in time, and perform imaging examination of the lungs and bronchoscopy, etc., which can specify the location of tracheal diverticulum.