The invention discloses an assisting reminder method and system for a vehicle approaching from the rear area. The assisting reminder method for the vehicle approaching from the rear area comprises thesteps that whether a vehicle approaches from the rear area or not and whether a turning light of the vehicle approaching from the rear area is turned on or not are determined; distance, speed, and acceleration of the vehicle approaching from the rear area are collected; when it is determined that danger exists, a warning message is sent to a driver of a current vehicle to prompt the driver to observe a rear view mirror. The invention further discloses an assisting reminder system for the vehicle approaching from the rear area. The assisting reminder system for the vehicle approaching from therear area comprises a controller module, an image processing module, an alarm module, and a sensor module, wherein the image processing module, the alarm module, and the sensor module are connected with the controller module, and the image processing module is connected with an image acquisition device. according to the assisting reminder method and system for the vehicle approaching from the rear area, the speed, the acceleration, the turning light, and the distance from the current vehicle of a rear vehicle are collected to determine whether the current vehicle is in danger and to prompt the driver to observe the rear view mirror as an auxiliary reminder, and the speed, the acceleration, the turning light, and the distance from the current vehicle of a rear vehicle are necessary supplementary information for the driver to drive safely.