The invention relates to a high-temperature fire tube type waste heat boiler tube plate cooling room. The high-temperature fire tube type waste heat boiler tube plate cooling room comprises four parts including a cooling room tube plate, a synthetic air tube flexible tube plate, a synthetic air tube and a cooling water tube. The cooling room is enclosed space formed by the cooling room tube plate and the synthetic air tube flexible tube plate, the synthetic air tube penetrates through the whole cooling room through the flexible tube plate and the cooling room tube plate, and the cooling water tube is connected into the cooling room through the cooling room tube plate. The cooling room is in a certain height, therefore, the uniform distribution of the cooling water nearby the flexible tube plate is guaranteed, and the situation that the flexible tube plate is overheated caused by the less local cooling water distribution is avoided. The cooling water enters the cooling room from the cooling water tube to flow out through the end outlet of the cooling water tube, and functions of the intensification of flowing nearby the synthetic air tube and the elimination of flowing dead zones are achieved. An insulation casting tube is arranged in the synthetic air tube close to the inlet of the flexible tube plate, therefore, the local thermal resistance can be increased, the local heat transmission capacity can be reduced, and the thermal stress and the temperature nearby tube walls are reduced.