The invention relates to the computer image processing technical field, particularly a method for video monitoring illegality of a transportation vehicle. The method comprises the following steps of selecting any one of a single system connection manner and a system connection manner, arranging a monitoring region, acquiring data, recognizing vehicles, and recording. Images for monitoring and recording vehicle illegal behavior are acquired by a same image collector. Pictures for recording the license tag of the illegal vehicle have high resolution, and an image range accordant with that of the picture for recording vehicle illegal position. The recorded data also includes a video stream file for recording vehicle illegal process. The method can monitor and record not only the vehicle illegal behavior of red light violation, but also other illegal behaviors such as illegal turning, driving along solid central line, driving in forbidden roadway, driving across solid central line, over-speed, driving along converse roadway, abnormal parking, etc., and can be widely used in transportation vehicle illegal administration.