The invention relates to a method for judging braking states of train carriages. The method comprises the following steps: collecting data packets which are obtained by storing brake cylinder pressure data collected by an electronic label arranged on each train carriage through a sensor, wherein the data packets comprise time marks; respectively taking out the data packets collected from the samecarriage, and acquiring a pressure variation equation of the carriage by utilizing the data packets; respectively setting a plurality of time points in the equation with the same time interval; comparing whether values acquired from each pressure variation equation on the time points are the same with each other or within the pre-set error, if so, judging that all the train carriages are in a normal braking state, or else, judging that all the train carriages are in an abnormal braking state. The invention further relates to a system for judging braking states of train carriages. The method and system for judging the braking states of the train carriages provided by the embodiment of the invention have the beneficial effect that the braking states of the train carriages can be automatically judged in real time.