The invention discloses a castor-based parallel-type multifuel diesel engine lubricant composition, which employs polyinternalolefins and sebacic acid polyglycol ester as base oil, and a plurality of composite additives are cooperated. The castor-based parallel-type multifuel diesel engine lubricant composition comprises a cleaning agent, a dispersant, an antioxidant antiseptic, a metal deactivator, a friction improver, an auxiliary agent and a strengthening agent. The lubricant composition has excellent abrasion resistance, high temperature detergency and dispersibility, high temperature antioxidation performance, good antirust and corrosion resistance performance, excellent shearing stability, and good low temperature starting performance; can prevent generation of low temperature greasy filth, has better antiwear and extreme pressure bearing capability, and is suitable for all kinds of diesel oil engines.