Method for reminding coming bicycle and obstacles of bicycle

The invention discloses a coming vehicle and obstacle reminding method. The method comprises the following steps: monitoring the real-time speed V1 of a riding vehicle; the real-time speed V2 of a coming vehicle behind the riding vehicle is collected; and when judging that the real-time speed V2 of the coming vehicle is greater than the real-time speed V1 of the riding vehicle, sending out first warning information. According to the method, the real-time speed V1 of the riding vehicle and the real-time speed V2 of the coming vehicle behind are detected and collected, and the first warning information is sent out when the real-time speed V2 of the coming vehicle is larger than the real-time speed V1 of the riding vehicle, so that a rider does not need to frequently observe road conditions before actions such as lane changing, overtaking, turning or obstacle avoiding, and the riding efficiency is improved. And only when the first warning information is received, the user turns back to observe the road condition