In newborns with congenital lacrimal obstruction, the lacrimal duct is obstructed and tears are stored in the tear sac, causing bacterial growth and secondary infection. Therefore, lacrimal duct obstruction and dacryocystitis are often concomitant, and in some cases, acute dacryocystitis may even occur. The symptoms of acute dacryocystitis are redness and swelling of the skin at and around the tear sac, cyst-like swelling palpable at the tear sac, difficulty in opening the eyes in severe cases, severe swelling at the tear sac, high skin tension, thin and shiny, and even self-rupture, with thick pus or bloody pus overflow. At this time, treatment should not be done by incision and drainage of pus from the lacrimal sac area, but by draining the lacrimal duct from above, i.e. trying to draw out the pus from the lacrimal point and at the same time performing repeated lacrimal sac irrigation to relieve local inflammation. It is also necessary to pay attention to the child’s systemic condition. Timely routine blood tests and systemic antibiotic therapy are systemic safeguards for local treatment. When the acute inflammation is relieved, topical antimicrobial agents are ordered for the eyes, and parents are taught to squeeze the purulent secretions from the tear sac for their children daily and flush the tear ducts regularly to avoid recurrence of acute infection. When the child’s systemic condition allows, the lacrimal duct is unblocked in a timely manner.