The invention discloses a film-coating agent for treating chronic eczema, expressed by weight, consisting of 15-42g of calamine powder, 7-23g of paeonol, 83-125g of ethylene glycol, 2-8g of polyvinyl alcohol, Composition of ciclopirox olamine 0.5~2.1g, ethanol 500~900g. In the present invention, calamine powder and paeonol have obvious effects on inhibiting bacteria, and calamine powder and paeonol are prepared into medicine, and due to the ciclopirox amine transdermal technology, the penetrating power of medicine skin limbs has been increased, It shows the superior curative effect of the coating agent on chronic eczema; the chronic eczema medicine made of polyvinyl alcohol has no greasy feeling, is easy to spread, has strong adhesion, has a certain tear resistance strength, is easy to use, and is non-toxic to the skin. irritating.