An embodiment of the invention provides a train carriage braking control method. The method comprises steps as follows: acquiring the current train marshaling quantity; acquiring the number and the type of a current carriage; calculating braking force of the current carriage according to a train brake instruction and the current train marshaling quantity, and conducting brake control on the current carriage. According to the technical scheme, under the condition of random marshaling of each train, the braking force required by each carriage is calculated according to the real-time acquired train marshaling quantity as well as the number and the type of the current carriage, and brake control is performed on the train, so that normal operation of brake control under the condition of flexible marshaling can be guaranteed and is not limited by train order adjustment or carriage marshaling adjustment. According to the scheme, BCUs (brake control units) of the carriages are free of primary-secondary difference, have the same control level and are mutually redundant, so that BCU use of a single carriage is reduced, and operating cost is reduced.