The invention discloses a right-turning intelligent vehicle two-stage braking active collision avoidance system based on a collision time, and the collision avoidance system comprises the following parts: an information sensing system which is used for detecting the information of a target vehicle and the state information of a pedestrian, and outputting the information of the target vehicle and the state information of the pedestrian; a collision time calculation system that is used for receiving the target vehicle information and the pedestrian state information, classifying collision conditions, calculating collision time and outputting the collision time; and a two-stage braking active collision avoidance system that is used for receiving the collision time and executing collision avoidance after performing grade judgment. The invention discloses a right-turning intelligent vehicle two-stage braking active collision avoidance method based on the collision time.