Air supply system for sleeper compartment

The invention provides an air supply system for a sleeper compartment and belongs to the technical field of rail vehicles. The air supply system for the sleeper compartment comprises a main air duct,an upper berth air duct, a lower berth air duct, a transverse wall air duct, an upper berth air volume adjusting device and a lower berth air volume adjusting device, wherein the main air duct is arranged in a compartment roof; an upper berth branch air duct and a lower berth branch air duct are connected to the main air duct; the upper berth air duct and the lower berth air duct are arranged outside a compartment side wall in the longitudinal direction of the compartment; the upper berth air duct communicates with the main air duct through the upper berth branch air duct; an upper berth air outlet for providing fresh air to an upper berth is formed in the upper berth air duct; the transverse wall air duct is arranged in a transverse wall; the transverse wall air duct communicates with themain air duct through the