The invention provides a road junction traffic signal controller capable of fast finding abnormal parking and a method. A road junction traffic signal machine is directly used for performing continuous video tracking on a vehicle so that whether the vehicle abnormally parks at the road junction or not can be found, other systems do not need to be arranged on the road junction, and installation space and installation cost are saved. When a green lamp lights, the system immediately judges whether the vehicle still stops or not, if the vehicle still stops, whether a vehicle which is right ahead of and closely adjacent to the vehicle stops or not is immediately judged, if there is no vehicle stopping right ahead of the current vehicle, it shows that the vehicle abnormally stops, and abnormal parking alarm information is sent to a monitoring center. According to the scheme, once the vehicle stops immediately, the vehicle can be found fast and an alarm can be given fast even though the vehicle which abnormally stops does not cause jam of the road junction, and better timeliness and accuracy are achieved.