The invention belongs to the technical field of medicines and particularly relates to a montelukast sodium chewable tablet and a preparation method thereof. The montelukast sodium chewable tablet provided by the invention is composed of montelukast sodium, a diluting agent, a lubricating agent, a binding agent, a disintegrating agent, a coloring agent, a sweetening agent and a corrigent. A preparation process of the montelukast sodium chewable tablet adopts absolute ethyl alcohol as a solvent to prepare the binding agent and then the binding agent is mixed with powder of other raw materials and auxiliary materials to carry out wet-method granulation. After being dried, wet grains are mixed with the corrigent and the lubricating agent and then a mixture is tabletted. According to the montelukast sodium chewable tablet prepared by using the process method provided by the invention, the color and the luster of the appearance of the tablet are uniform and bright, the stability is good, the disintegrating speed is high and the bioavailability is high.