The invention discloses a license plate number retrieval method based on a full-text search engine. The method comprises the steps that a front-end service system sends a retrieval request to a full-text search engine cluster server; after receiving the retrieval request, the full-text search engine cluster server retrieves the vehicle data meeting the retrieval condition from the database and takes the vehicle data as a result set; the license plate number retrieval plug-in compares the license plate number of each piece of vehicle data in the result set with a target license plate number andscores the matching degree of each piece of vehicle data in the result set, and the license plate number retrieval plug-in sends the result set and the matching degree score of each piece of vehicledata in the result set to the front-end service system; and the front-end service system selects the data of the license plate number with the matching degree score greater than a set threshold in thefinal result set as a retrieval result and displays the retrieval result at the front end.