Heat exchanger with protection mechanism

The heat exchanger with the protection mechanism comprises a box body, a heat exchange pipe is arranged in the box body, a sliding groove is formed in the surface of one side in the box body, a sliding block is connected into the sliding groove in a sliding mode, a floating plate is connected to one side of the sliding block in a gluing mode, and a water suction nozzle is arranged on the surface of the bottom of the floating plate through a reserved hole. A water pump is arranged at the top of one side of the box, and the top water inlet end of the water pump is connected with a water suction nozzle through a pipeline. According to the heat exchanger with the protection mechanism, the floating plate can enable the water suction nozzle to float at the liquid level position, so that when a water pump works, the water suction nozzle can suck liquid from the liquid level position, precipitated impurities in the box body are prevented from being sucked, the use requirements of personnel are met, and the heat excha