The utility model relates to a fare evasion proofing device, and particularly relates to an infrared fare evasion proofing device. The infrared fare evasion proofing device aims to solve the problem of increasing of fare evasion rate of passengers when an automatic ticket checker is used. The device includes a ticket checker, and further includes an infrared detector, a blocking door, an elevating tooth bar, a motor, and a gear, the ticket checker is arranged on the ground of a ticket entrance, the infrared detector is fixedly arranged on the ground behind the ticket checker, the motor and the blocking door are arranged under the ground behind the infrared detector, the elevating tooth bar is fixedly arranged on one side surface, facing the motor, of the blocking door, and the center line of the elevating tooth bar in the length direction is parallel to the center line of the blocking door in the length direction, the gear sleeves on the rotating shaft of the motor and is engaged with the elevating tooth bar, and the signal receiving end of the motor is connected with the signal outputting end of the infrared detector. The infrared fare evasion proofing device is applicable to the field of rail transit.