Car anti-rear-end-collision device

The utility model discloses a car anti-rear-end-collision device, which comprises a single chip, wherein a laser radar distance measurement instrument, an acceleration sensor and a power supply are connected to the input end of the single chip; an LED display screen, an alarm device, a relay and an LED brake lamp are connected to the output end of the single chip; a main controller adopts the single chip ATmega8L; the type of the acceleration sensor adopts MMA72600T; the LED brake lamp comprises an LED array; and LEDs adopt 1W high-brightness LEDs. According to the device, the brake acceleration and the spacing distance of a car can be displayed in real time; if the spacing distance is smaller than the safety distance, the device gives an alarm; if the brake acceleration value is higher than the setting threshold value, the LED brake lamp at the tail part of the car is on; and the device is simple in structure and strong in commonality, can effectively prevent the car rear-end collision, and improves the safe