The invention provides an aryl alkane acid derivative containing a pepper ring and a preparation method thereof. The aryl alkane acid derivative containing the pepper ring provided by the invention can be applied to researches of drugs for treating cardiovascular diseases and anti-atherosclerotic drugs, has pharmaceutical activity of remarkably reducing total cholesterol and triglyceride, and has a relatively small side effect. The preparation method of the aryl alkane acid derivative containing the pepper ring provided by the invention is simple to operate and easy to implement, can be completely used for batch preparation of a target compound, and is relatively low in cost and suitable for industrial production.