The invention discloses a fraud phone detection method based on intention understanding technology. The method is characterized by comprising the following steps: an intention understanding model training step based on the fraud type; and an intention understanding model assessment step based on the fraud type. A large number of fraud scripts are automatically classified, the intention understanding model suitable for various fraud phones is trained by using the machine learning algorithm; compared with the existing models of pretending public security organs, pretending the familiar and leader, pretending the customer service, pretending the soldier and load fraud, the effective analysis on mass data can be effectively realized, and the fraud phone can be quickly identified and early-warned in quasi real-time.