The invention discloses a detection and early warning method based on multi-mode vehicle characteristics, which comprises the following steps: S1, establishing a video monitoring snapshot system on aroad in advance, snapshotting vehicles running on the road through the video monitoring snapshot system, and shooting pictures of the vehicles to complete the collection of vehicle information; S 2, transmitting the image obtained in the step S1 to a computer in a data mode, and preprocessing the image through image processing software built in the computer; S 3, firstly constructing an experimentsystem; then, transmitting the picture preprocessed in the step S2 to an experiment system; enabling the experiment system to collect vehicle information in the picture. By means of the video monitoring snapshot system, information collection can be directly conducted on vehicles running on the road, the collection range is widened. Images are processed through the image preprocessing system. Definition of the images is improved. The effect of comparing the characteristics of the vehicles subsequently is improved, and the possibility of errors is reduced.