The invention relates to a pulmonary marker, used for marking the lesion position of the lung. The pulmonary marker comprises a self-expanding structure which can radially expand automatically after being released from a compression device so as to realize marking. According to the pulmonary marker, due to the adoption of the self-expanding structure, when the lesion position is found during the lung examination, the pulmonary marker can be conveyed to the lesion position through a catheter or a conveyor, then the self-expanding structure is extruded and fixed by the pulmonary parenchyma after expanding at the lesion position, therefore, during the surgical operation, a doctor can rapidly locate the lesion position, thus the surgical time is shortened, the excision extension is reduced, and the postoperative quality of life of a patient is improved.