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This utility model discloses a Teflon heat exchange device for hot waste gas, including a housing; a heat exchange mechanism disposed inside the housing for heat exchange and a locking mechanism adapted and fixed to the heat exchange mechanism; the heat exchange mechanism includes a conveying pipe disposed inside the housing for gas conveying during heat exchange and a connecting component supporting the conveying pipe, with an installation component for connecting to the housing disposed on the outside of the connecting component; this utility model, through the cooperative arrangement of the heat exchange mechanism and the locking mechanism, can fix and limit several sets of conveying pipes required for heat exchange, and can insert them into the heat exchange container to perform heat exchange operations. The operation method is simple and easy to use. The heat exchange mechanism ensures maximum heat exchange through the meandering conveying of several sets of hot waste gas pipes, while the locking mechanism is used to clamp and limit the pipes in the heat exchange mechanism and lock them by abutting, thereby improving the required limiting and locking effect.