A disassembly technique for a multifunctional robot to disassemble a paper pile comprises tray disassembling, wood plate disassembling and paperboard disassembling, wherein the paper disassembling comprises pre-stacking, lifting, inserting, pressing and removing. The technique provides all actions for the paper pile disassembling and realizes the automation of paper pile disassembling. The appearance structure of a paperboard is can be recognized and a grasping direction is selected; the front and back of the paperboard are distinguished according to colors, and then whether the paperboard needs to be turned over is further selected; wood plates and partition boards on the top are drawn during feeding of the paper pile, empty trays can be grasped after disassembling the paper pile, the action that a worker climbs high for disassembling is omitted, and the labor intensity of the worker is decreased greatly.