The invention relates to a commercial vehicle tail anti-collision device, and discloses a commercial vehicle active control anti-collision mechanism for protecting passengers and vehicles on multiple angles. The mechanism has multiple anti-collision functions, and can actively control the mechanism parameter to reduce the collision harm to vehicles and passengers. The impact energy of the vehicle in rear-end collision is absorbed by mating reaction of a spring and a damper, the collisions at different positions are actively controlled, thereby reducing the damage of vehicles and passengers by the vehicle rear-end collision accident; meanwhile, a camera and a radar mounted on the mechanism can actively control the spring damper through an electric control mechanism, and lighten the harm caused by collision greatly through actively adjusting the parameters of the spring and the damper; moreover, multiple driving modes can be used for realizing the mated work of the radar and the camera, thereby protecting passengers, in particular to children, buildings, and vehicles, and realizing the safe driving.