The invention relates to a device for achieving docking and separating between a temperature adjusting unit and a launch canister, in particular to an air duct sealed docking device. The air duct sealed docking device is simple in structure, large in ventilation quantity, high in environment adaptive capacity and capable of achieving rapid docking and separating between the launch canister and the temperature adjusting unit. The air duct sealed docking device comprises an air deflector (1) and a hood (2). The upper end of the air deflector is used for being fixedly connected with a launch canister air duct (3) in a sealed manner. The lower end of the air deflector is fixedly connected with a rubber seal ring (4). The hood is used for being fixed to a hatch of the temperature adjusting unit (5). The air deflector can be sealed to the hatch of the temperature adjusting unit through the rubber seal ring. When the air deflector is sealed to the hatch of the temperature adjusting unit through the rubber seal ring, the temperature adjusting unit can communicate with the launch canister air duct through the hood and the air deflector.