A railroad vehicle door control system which can continue the opening and closing of a door while ensuring the security is provided. Each of door controllers 10 provided for respective doors 101 of a railroad vehicle 100 includes a motor 50 for opening and closing the door 101 and a first controller 11 and a second controller 12 which are able to control the motor 50 based on an instruction from a train information controller 20. While the first controller 11 is controlling the motor 50, the second controller 12 obtains the control information of the first controller 11 and another door controller 10 from a local communication line 32. If the control information of the first controller 11 is different from the control information of the second controller 12 and the control information of the other door controller 10, the second controller 12 switches the control of the motor 50 from the control by the first controller 11 to the control by the second controller 12.