The invention discloses fresh and crisp walnut chili sauce and a preparation method thereof. The walnut sauce is prepared from the following components by weight: 75-95 parts of peeled walnut kernels,150-190 parts of dried chilies, 30-50 parts of beef, 30-50 parts of dried turnips with the water content of 10%-30%, 5-9 parts of rapeseed oil, 1-5 parts of white sesame seeds, 1-5 parts of chives, 2-7 parts of jerusalem artichoke, 1-5 parts of fresh ginger, 1-5 parts of black garlic, 10-14 parts of soybean paste, 1-5 parts of seafood sauce and 1-5 parts of lemon juice. The preparation method comprises the following steps: rehydration, dicing, baking, pre-frying, pickling, stir-frying and radiation sterilization. The fresh and crisp walnut chili sauce is dark red in sauce, uniform and consistent in color, outstanding in walnut kernel and chili fragrance, harmonious and rich in fragrance, moderate in salinity and pungency degree, smooth and not greasy in taste, rich in aftertaste, fresh and crisp in taste and rich in hierarchy, remarkably improves the taste of products, prolongs the shelf life of the products, has huge development value, and is suitable for large-scale production. Andthe fresh and crisp walnut chili sauce and the method have wide practicability and development value in the field of food processing.