The invention discloses a bus abnormal data repairing method based on front vehicle data, which relates to the technical field of traffic data processing. The method comprises the following steps of 1) monitoring the abnormal situation of the running data of bus in real time, and turning to a step 7) if the abnormal situation of the data is not occurring; 2) extracting the data of the front vehicle of the data abnormal bus, and calculating the grey correlation degree of each front vehicle and the data abnormal bus; 3) estimating the bus speed value of the data abnormal moment based on the front vehicle speed; 4) obtaining the historical speed of the time period of the road section where the data abnormal bus is located; 5) repairing the speed information in the abnormal data of the bus; 6)repairing the position information in the abnormal data of the bus; 7) storing the running data of the bus into a database. According to the method, the bus speed and the position information can beeffectively processed when the bus speed and the position information are wrong or lost, so that the influence of abnormal data of the bus is reduced, and more reliable bus service information is provided for the public.