The invention discloses an amoxicillin orally disintegrating tablet and a preparation method thereof. The orally disintegrating tablet comprises the following raw materials in parts by weight: granulation raw materials: 10 to 15 parts of amoxicillin, 1 to 3 parts of colloidal silicon dioxide, and 0.5 to 1 part of povidone K30; granulation auxiliary materials: 4 to 8 parts of microcrystalline cellulose, 0.2 to 0.6 part of aspartame, and 0.4 to 0.8 part of croscarmellose sodium; external auxiliary materials: 0.4 to 0.8 part of croscarmellose sodium, 0.1 to 0.2 part of magnesium stearate, and 0.4 to 0.8 part of orange flavor. The disintegrating tablet has the effects that an object product has stable characters through a reasonable formula, and specific dosage ratio and constituents among all the components, the disintegration time meets expectation, and contents of relevant matter and amoxicillin meet the requirements of standards.