High-temperature flue gas heat exchanger

The high-temperature flue gas heat exchanger comprises a cooling box, a supporting seat, a movable seat and a liquid storage box, a first hollow column and a second hollow column which are both fixedly connected with the upper end of the supporting seat are arranged between the cooling box and the liquid storage box, and a submersible pump is fixedly connected into the liquid storage box. The output end of the submersible pump is fixedly connected with a water conveying pipe which penetrates through the liquid storage box, is fixedly connected with the penetrating part and fixedly communicates with the second hollow column, limiting grooves are formed in the front end and the rear end of the interior of the cooling box correspondingly, and dust filter screens slidably connected with the limiting grooves are arranged in the limiting grooves. A heat conduction coil fixedly connected with the interior of the cooling box through a mounting rod is arranged at the lower end of the dust filter screen, and the water