Safety early-warning system for getting on and off

The invention discloses a safety early-warning system for getting on and off. The system comprises detecting systems, a central control system, an engine managing system, a door opening-closing system and human-machine exchanging systems, wherein the detecting systems are a plurality of detecting radars which are arranged at different positions outside a vehicle; the central control system is a central processing unit which is mounted in a driving cab; the engine managing system and the door opening-closing system are mounted as parts of the body of the vehicle, and can be used for detecting gear positions of an engine, the speed of the vehicle, and the opening-closing state of a vehicle door; the human-machine exchanging systems are loudspeakers, door lamps or display screens, which are arranged at the periphery of the vehicle door; each system is respectively and electrically connected with the central control system. For the system disclosed by the invention, the position and the speed of the object close to the rear of the vehicle in a stationary or idle state are detected through the detecting system, the condition whether a danger exists or not is judged by the central control system, the sound, the photo electricity or other warning information is sent to passengers ready to get on and off in time through the human-machine exchanging systems, and the passengers are warned to avoid the danger, so that the occurrence of traffic accidents can be effectively reduced.