The invention provides a preparation method of benazepril hydrochloride tablets. Benazepril hydrochloride which serves as an active component of the medicament is combined with auxiliaries filler, adhesive, disintegrating agent, lubricant magnesium stearate and a coating material to prepare particles, and the particles are made into tablets. The method is characterized in that the lubricant magnesium stearate is added after other components are granulated and coated, and the components are uniformly mixed and tableted. The preparation method can physically isolate benazepril hydrochloride from the magnesium stearate effectively, so that the problem that the variety over rises in the storage process, and the medicament quality is effectively controlled. The preparation method has high use value.