Rail vehicle carriage connecting device for rail transit

The utility model relates to the field of rail transit, and discloses a rail vehicle carriage connecting device for rail transit, which effectively solves the problem that the buffering effect is poor as only one spring is used for buffering between two carriages at present, and comprises two carriages, and a connecting assembly is arranged between the two carriages. The connecting assembly comprises a connecting unit installed on one side of one compartment, a buffering unit is installed on one side of the connecting unit, and the buffering unit is connected with the other compartment. According to the compartment buffering device, after the first piston block moves in the buffering sleeve, the first spring is compressed, and therefore the compartment is buffered; and gas in a buffer sleeve is pushed to enter a movable groove, so that a second piston block is pushed to move towards one side of a pressing plate, a second spring is compressed, the second spring generates reverse thrust on a second connecting p