The invention discloses an intelligent terminal touch authentication method and system based on a vibration signal, and the method comprises the steps: actively generating a specific vibration signaland collecting the vibration signal through an IMU sensor when an intelligent terminal detects a finger touch, and respectively extracting a biological feature, a behavior feature and an independent touch behavior feature from the received vibration signal; and then, classifying the biological characteristics by adopting a neural network based on a twin network architecture so as to realize behavior-independent intelligent terminal touch authentication. According to the method, the intelligent terminal is used for actively sending out the vibration signal to capture the biological characteristics of the touch finger so as to identify different users, and the method does not depend on the behavior characteristics of touch.