The invention provides an intelligent retrieval method and system for a patent. The method comprises steps including a first retrieval formula acquisition step, a retrieval result A acquisition step, a high-frequency key word extraction step, a second retrieval formula acquisition step, a retrieval result B acquisition step, a feature vector extraction step and a retrieval result C acquisition step. With the adoption of the intelligent retrieval method and system for the patent, key words can be adjusted intelligently and automatically for correction of the retrieval direction, features are extracted from preliminary retrieval results, so that key word retrieval is replaced by feature retrieval, the retrieval precision is improved, and missing retrieval can be effectively prevented; secondary screening is performed in combination with key words such as the publication date and the like, retrieval results with advanced analysis functions such as patent early-warning, patent value and the like can be acquired, all retrieval results are acquired step by step through repeated retrieval in different ranges, so that the retrieval calculation quantity and the retrieval quantity are reduced, and the retrieval time is shortened.