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The utility model relates to bag sealing technical field, concretely is a kind of heat sealing device of biodegradable bag. It includes frame, bag mouth smoothing device and bag mouth heat sealing device. Frame is provided with mounting bracket;Bag mouth smoothing device includes lifting plate, two shift poles of sliding installation on lifting plate and the drive assembly for driving two shift poles mutually close or away;Second air cylinder for driving lifting plate lifting is installed on mounting bracket;Bag mouth heat sealing device includes two hot-pressing mechanisms of symmetrical arrangement. The utility model passes through bag mouth adsorption, smoothing, heat sealing and a series of orderly operation steps, realizes the high-quality sealing of biodegradable bag.