Double-layer train compartment and train

The embodiments of the invention provide a double-layer train compartment and a train. The double-layer train compartment comprises a compartment space defined by a top rack, side walls, a bottom rackand end walls. The compartment space comprises a passenger seat space and a channel space. The passenger seat space is divided into an upper layer passenger seat space and a lower layer passenger seat space by a floor structure in a passenger region. An air supply system is arranged in the compartment and comprises an air conditioner unit and an air supply duct used for conveying flowing air output by the air conditioner unit to the passenger seat space. The air conditioner unit is arranged at the top of the channel space. The air supply duct is arranged on at least one side, in the train advancing direction, of the top of the upper layer passenger seat space and/or the top of the lower layer passenger seat space. By means of the scheme, the air supply system can be reasonably arranged inthe double-layer train sp