The invention belongs to the technical field of vehicle meeting safety, and discloses a device and method for improving the vehicle meeting safety performance. The device for improving the vehicle meeting safety performance comprises a vehicle-mounted CAN bus, a single-chip microcomputer, a data processing unit, a rearview mirror, a vehicle speed sensor, a steering wheel angle sensor, a brake pedal stroke sensor, a laser scanning radar, a camera and a rotation motor, wherein the laser scanning radar is fixedly installed in the right middle of a front bumper of a vehicle, the camera is used for collecting images of the head of a driver, and the rotation motor is used for rotating the rearview mirror. The laser scanning radar faces the position in front of the vehicle, the output end of the vehicle speed sensor is electrically connected with the vehicle-mounted CAN bus, the signal input end of the data processing unit is respectively and electrically connected with the vehicle-mounted CAN bus, the laser scanning radar, an I/O interface of the single-chip microcomputer, the output end of the steering wheel angle sensor and the brake pedal stroke sensor, the signal output end of the data processing unit is electrically connected with the control end of the rotation motor, and the single-chip microcomputer is electrically connected with a video line of the camera through a USB interface.