The invention belongs to the technical field of medicine, and in particular relates to a stable montelukast oral rapidly disintegrating film as well as a preparation method and an application of the montelukast oral rapidly disintegrating film, wherein a film-forming material is a mixture of hydroxypropyl methyl cellulose and polyvinyl alcohol according to a certain proportion. The product (the montelukast oral rapidly disintegrating film) is high in stability and suitable for industrial mass production.