Laser detection type derailment automatic braking system

The invention discloses a laser detection type derailment automatic braking system, and the system comprises a laser ranging module which comprises a plurality of laser ranging sensors and is used for measuring the distance of a train deviating from a track; the data processing module is used for setting a standard error interval and a standard distance value, extracting the measurement data, and judging that the measurement data is abnormal data if the measurement data is located outside the standard error interval; the derailment judgment module is used for extracting the abnormal data, acquiring measurement data measured by a plurality of laser distance measuring sensors on the two sides of the laser distance measuring sensor corresponding to the abnormal data as comparison data, and judging derailment if the abnormal probability of the comparison data exceeds a set threshold value; and the braking module is used for communicating a passage between the main air pipe and the atmosphere in a derailment state