The invention discloses an automatic unloading calandria device for a micro-channel flat tube, comprising a machine frame, wherein a positioning plate is respectively arranged at each of the two ends of the machine frame, and an unloading chute is arranged on each positioning plate. An unloading chassis is arranged on the inner side of each positioning plate, a pushing plate and a stop block are arranged on one side of the unloading chassis, and the positioning plates, the unloading chassis and the pushing plates constitute an unloading mechanism. A support plate is arranged on the machine frame, a speed reducing motor, a transmission gear set and a sprocket set are arranged on the support plate, a first feeding lead screw and a second feeding lead screw are arranged on the lower part of the support plate, and a calandria mechanism is constituted by the support plate, the speed reducing motor, the transmission gear set, the sprocket set, the first feeding lead screw and the second feeding lead screw. The automatic unloading calandria device for the micro-channel flat tube is simple in structure, reasonable in design, convenient to operate, high in automation degree and also has good stability.