The invention belongs to the field of pharmaceutical preparations, and particularly relates to effervescent tablets containing a stiripentol solid dispersion and a preparation method thereof. According to the effervescent tablets disclosed by the invention, in one aspect, an indissolvable drug is prepared into an amorphous solid dispersion, so that the defect that the permeability of gastrointestinal tracts is reduced by other solubilizing means is overcome while the water solubility and the dissolution rate are improved, and the effervescent tablets have relatively high encapsulation efficiency (16.67%-50%); in the other aspect, a common, easily available and safe enteric-coated material is selected as a solid dispersion carrier to ensure that the stiripentol is released in the small intestine in a positioned manner and cannot be dissociated in advance in a physiological solution to cause damage of gastric acid to medicine like other preparation means; and besides, compared with commercially available dosage forms (capsules and dry suspensions), the effervescent tablets overcome the problem that the content is easy to cake, and has the advantages of stable storage, convenience in taking, good taste, particular suitability for epilepsy children who cannot swallow solid preparations, and the like.