The present invention relates to a device for exchanging a fusion unit set of a hot air fusion apparatus. A user can rapidly and safely replace a fusion unit set by only manipulating a hand lever, which drives a fixation pin and a stopper, through driving the fixation pin by an air cylinder having the hand lever and interposing a release lever between the fixation pin and the stopper in order to link the stopper with the fixation pin. The device includes: a fixation block; the stopper which prevents the fusion unit set from moving; the air cylinder installed on the hot air fusion apparatus; the fixation pin which fixates an exchange cart; and the release lever which is linked with the fixation pin and pivots the stopper.
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