The utility model relates to a die separation device, in particular to a multifunctional aluminum alloy extrusion die separation device. The multifunctional aluminum alloy extrusion die separation device comprises a horizontal type rack provided with an ejecting hydraulic cylinder on the rear side, and is characterized in that an ejecting plate is mounted at the head of the ejecting hydraulic cylinder; a die is placed in the middle of the rack, and a height adjusting plate is mounted in the middle of the rack; a die sleeve baffle block is arranged at the front end of the rack; width adjusting plates are mounted on two sides of the die sleeve baffle block; a shearing hydraulic cylinder is arranged at the upper part of the die sleeve baffle block; and a shearing blade is assembled at the head of the shearing hydraulic cylinder. According to the multifunctional aluminum alloy extrusion die separation device, manual work is replaced with hydraulic pressure, so that the die and the die sleeve are separated, residual aluminum on the die is sheared, and the device is simple, practical, time-saving, labor-saving, safe and reliable and cannot damage the die.