The invention discloses a train sleeper capillary network radiation air-conditioning system and belongs to the technical field of train air conditioning. The air-conditioning system comprises a trainsleeper carriage 1, a cold/hot water unit 2, an all-air air-conditioning unit 3, a ventilation device 4, a sleeper area 5, a corridor area 6, an air supply opening 7, an air return opening 8, a watersupply main pipe 9, a water return main pipe 10, a capillary network 11, a radiation plate 12, heat insulation cotton 13, a bed plate 14, outside-train fresh air 15, fresh air 16, air conditioner supplied air 17, an in-carriage return air 18 and a flow controller 19. The train sleeper capillary network radiation air-conditioning system adopts a capillary network radiation air-conditioning system and an all-air air-conditioning system to control the environment in the same section of a sleeper carriage, the temperature field in the same section of train sleeper carriage can be subdivided, the different requirements of different passengers in the same section of carriage on the temperature can be met, the air-conditioning blowing feel can be reduced, the air-conditioning noise can be reduced, the temperature field distribution in the sleeper area can be more uniform, and the air-conditioning energy consumption can be greatly reduced.