The invention discloses a sabot separator with the buffer effect achieved through electromagnetism and hydraulic pressure together. A hydraulic buffer section is arranged, the buffer effect is achieved through resistance, generated when a piston rod and a silencer move relatively, of hydraulic oil filled in the interior, and the centering effect can be achieved; meanwhile, an electromagnetic buffer section is arranged, electromagnets generate the magnetic force effect, and the further buffer effect is achieved; and the speed loss is compensated for through the force, in the direction opposite to the direction of the first electromagnet, of the second electromagnet. Noise of an air cannon can be controlled through holes in the silencer. The sabot separator is simple in structure, free of rigid collision, capable of being disassembled and assembled and capable of reliably achieving sabot separation of the large-caliber high-speed air cannon.