It is not uncommon for lacrimal duct infections to be misdiagnosed clinically, but it is not difficult to diagnose if it is examined carefully. The clinical manifestations of lacrimal ductitis include redness, lacrimation, pus flow, redness and swelling at the tear dots, overflow of pus secretions when squeezing the tear dots, and beanbag-like material flushed out during tear flushing in most patients, usually with smooth tear flushing and no tear obstruction. The clinical manifestations of chronic dacryocystitis, mainly manifested as lacrimation, pus. When the lacrimal duct is flushed, it flushes up and down and up with purulent secretion overflow. Generally, there is no redness and swelling at the tear dots, and there is overflow of purulent secretion at the squeezed tear dots and bean residue-like material flushed out when the tear ducts are flushed. The treatment of lacrimal ductitis is usually performed under local anesthesia with lacrimal duct incision to remove the pus and scrape the stones in the lacrimal duct with a spoon, if combined with lacrimal obstruction can be jointly placed. In chronic dacryocystitis, lacrimal endoscopic lacrimal ductplasty + tube placement, internal or external lacrimal sac nasal anastomosis are feasible. The patient was found to have redness and swelling in the lower tear dots of the left eye and a large amount of purulent secretions were squeezed out during the examination, and when the patient’s medical history was inquired, the patient said that the left eye was often tearing and the secretions were increased. The discharge was slightly reduced, and the lacrimal punctum and the lower lacrimal duct were incised under local anesthesia and a large number of lumpy and mud-like yellow stones were found, which were removed with a scraper and cured after 10 days. This is a typical case of misdiagnosis.