The invention discloses an oxygen tube for a tracheal catheter and relates to the field of medical equipment. The oxygen tube comprises a tube body with a thin air supply section put into an artificial airway or nasal cavity of a patient in oxygen supply and a thick air-in section connected with an oxygen supply device, wherein the thin air supply section is communicated with a side hole small hose; and a plug cover is arranged at the end of the side hole small hose. The oxygen tube disclosed by the invention can solve the problems that the complicated step of cutting off an oxygen tube of a nose plug for oxygen therapy of an artificial airway patient and oxygen inhalation of a nasal catheter of a patient and then combining with a scalp needle to form a catheter oxygen tube wastes time and materials and the operation of taking out the oxygen tube and humidifying tube for sputum suction is not convenient and easily pollutes the catheter and causes exogenous infection.