The invention discloses a curvature filtering-based multi-focus image fusion method. The method is implemented by the steps of (1) inputting a to-be-fused multi-focus image; (2) performing curvature filtering on a long-distance focus image I1; (3) performing curvature filtering on a short-distance focus image I2; (4) obtaining images F1 and F2 after the curvature filtering; (5) generating a feature image matrix; (6) obtaining a focus degree parameter; (7) generating a temporary matrix; (8) generating an advance matrix; and (9) generating a fused image. Two multi-focus images having different focus distances and shot in a same scene are fused; while clear features of image edges are extracted, a clear region with higher focus degree is reserved; and the shortcomings of local pixel sudden change and local fuzziness in an existing multi-focus image fusion technology are overcome.