The invention discloses a breast lump image feature extraction method based on edge neighborhood weighing. The breast lump image feature extraction method mainly solves the problem that in the prior art, extracted features do not contain the edge neighborhood local features of a breast lump. The breast lump image feature extraction method comprises the steps of (1) inputting an image, (2) adjusting the size of the breast lump image which is input, (3) extracting a lump edge, (4) determining the number of inner indentation pixel points and the number of outer extension pixel points, (5) determining the inner region of a lump which undergoes inner indentation, (6) determining the inner region of the lump which undergoes outer extension, (7) obtaining an edge neighborhood image of the breast lump, (8) obtaining weighing values, (9) extracting scale invariant features, (10) extracting word bag features and (11) obtaining features of the breast lump image which undergoes edge neighborhood weighing. By means of the breast lump image feature extraction method, expression of the features of the breast lump image are more robust, the image features are expressed more effectively, the benign and malignant classification accuracy of lumps is improved, and therefore doctors in the radiology department can be assisted in conducting medical diagnosis.