The invention relates to the field of internet information processing, in particular to a method and a system for network information extraction. The invention adopts a technical proposal which comprises the steps as follows: S1: information extraction rules are extracted from a rule database; S2: the information extraction rules are used as inquiry conditions for collecting network information and web pages which accord with the information extraction rules are used for establishing a primary database; S3: a user inquiry string is obtained; and S4: a web page which is matched with the inquiry string in the primary database is output. The invention can provide search results with high precision, which is different from traditional search engines and is an extremely effective and accurate information obtaining tool, thus substantially enhancing the obtaining efficiency of business information of people.