The invention provides a central air conditioner air-supply system and a track detection vehicle. The central air conditioner air-supply system comprises air-supply pipelines, near-end air outlets, far-end air outlets and separating air-supply devices. A cold air inlet is formed in one end of each air-supply pipeline; the near-end air outlets and the far-end air outlets are formed in the two sidesof the air-supply pipelines, and the near-end air outlets are located in one sides of the cold air inlets; and the separating air-supply devices are arranged in the air-supply pipelines, each separating air-supply device comprises a base plate and a separating air-supply plate, the base plates are connected to the pipe walls of the air-supply pipelines, the separating air-supply plates are connected to the base plates, air-supply openings are formed in the base plates, and separating air-supply openings are formed in the separating air-supply plates. The central air conditioner air-supply system can stably supply air to the far end.