The invention provides a levamlodipine besylate pharmaceutical composition and a preparation method thereof. Levamlodipine besylate, calcium carbonate and pharmaceutically acceptable excipients, such as a filling agent, a disintegrating agent, a lubricant and a binding agent, are mixed uniformly in batches according to a certain formula ratio to prepare a stable pharmaceutical composition, and further a medical preparation is prepared. The medical preparation is stable and has a relatively high quality level.