Trichinella spiralis and its derivative antigens stimulate T cell activation by inducing dendritic cell semimaturation, thereby regulating the Th1/Th2 type immune response and alleviating or inhibiting allergy and autoimmune diseases. The regulatory T cell and anti-inflammatory factors play important roles in this immunomodulatory process. This article reviews the modulatory effects and their mechanisms of Trichinella spiralis and its derivatives in autoimmune disorders.