The present invention relates to a disassembling method of a smartphone. According to the present invention, the disassembling method of a smartphone comprises the steps of: preparing the subject of disassembling, a smartphone; processing pretreatment of the smartphone in a heat chamber for preheating; heating the edge of the smartphone on 80 to 120°C; preparing a mixture for adhesive removal containing urea to disassemble the smartphone; treating the smartphone with the mixture for adhesive removal by injecting the mixture into the smartphone; and disassembling the smartphone.
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