The invention discloses a data leakage prraceion method based on a keyword technology. The method includes the following steps that 1, data investigation is conducted on business processes, and sensitive data that the business processes relate to is found; 2, data leakage risks are evaluated; 3, data is defined, wherein through the keyword technology, various document models under various scenes are defined in advance, a keyword system capable of representing data value is found, data to be detected is scanned, and by judging whether or not keywords are hit, it is judged that whether or not the data to be detected belongs to the sensitive data; 4, sensitive data is monitored and prraceed, and captured malicious attempts and malicious races are processed. By the adoption of the data leakageprraceion method based on the keyword technology, it is ensured that at any position and through any usage mode, the data leakage risks can be effectively reduced, and the work efficiency of data leakage prraceion is improved; safety of non-structured data on a user's terminal is protected, so that data leakage prraceion operation is more standardized and intellectualized.