Abstract: A load dependent braking pressure regulating device for railway vehicles comprises an auxiliary reservoir (8), a brake cylinder (10) and a control valve (9). A regulating valve (2), a sensor valve (4), a triggering board transmission mechanism (5) and a stop disc (6) are provided between the control valve (9) and the brake cylinder (10). A triggering head at the lower end of the stop disc (6) is right opposite the center of the triggering board of said transmission mechanism (5). The sensor valve (4) is connected with the control valve (9), the regulating valve (2), the brake cylinder and the pressure reduction reservoir(7). The device according to the present invention can prevent flat wheel accidents, enhance train operation safety, reduce operation cost and reduce the longitudinal impact between differently loaded cars in a train upon braking.