The invention discloses an atorvastatin calcium tablet and a preparation method thereof. The tablet contains atorvastatin calcium, polacrilin potassium IRP-88, carbomer 971P, acrylic resin IV, and ethyl cellulose and other pharmaceutically acceptable excipients. The present invention successfully solves the stability problem during the preparation and storage of atorvastatin calcium, and prepares the solid dispersion of atorvastatin calcium by using solvent deposition technology, which greatly improves the solubility of the drug; at the same time, through semi-permeable membrane coating, Side effects such as upset stomach are reduced.