Vehicle body rear anti-collision method and device

The invention discloses a vehicle body rear portion anti-collision method and device.The vehicle body rear portion anti-collision method comprises the steps that surrounding information of a vehicle is obtained, whether rear portion collision will occur or not is judged through the surrounding information, current rear portion collision risk information of the vehicle is obtained, and whether the current rear portion collision risk information reaches a preset risk or not is judged; when the current rear collision risk information reaches the preset risk, the tail door popping operation and the anti-collision beam extending operation are sequentially executed, after the tail door pops up, the anti-collision beam extends out of the trunk, the extending anti-collision beam can resist rear collision outside the trunk, the invasion amount of the rear collision into a passenger compartment is reduced, the passenger compartment is protected, and the safety of the passenger compartment is improved. The vehicle body