The invention discloses a dispute focus-based class case retrieval method and system, a dispute focus-based class case retrieval device and a medium, and relates to the field of natural language processing semantic similarity. The method comprises a dispute focus extraction processing step, a word segmentation processing step, a word vector acquisition processing step, a sentence vector acquisition processing step, a final dispute focus sentence vector acquisition processing step, an index database storage step, a final dispute focus sentence vector P acquisition step corresponding to a dispute focus to be retrieved and a corresponding retrieval step, a case corresponding to the topK similar dispute focus is obtained. According to the method, a sentence vector of a dispute focus is constructed by using a related model used for generating a word vector in the field of natural language processing, the construction method adopts an unsupervised mode, the complexity of manually labeling similar sentences is removed, the method is simple, and meanwhile, the method is based on semantic retrieval and is high in retrieval speed and accurate in retrieval result; and the recall rate and theaccuracy rate of class case retrieval based on dispute focuses are improved.