The invention discloses a nut cracker, and relates to the technical field of living goods. The nut cracker comprises a first spring and a second spring, the first spring is mounted on the inner upperportion of a can, the second spring is mounted on the inner lower portion of the can, a nut inlet-outlet port is formed in the side wall of the can, a hammer block is arranged between the first springand the second spring and movably connected with the can, and the inner diameter of the second spring is larger than the diameter of a nut. Compared with the prior art, the nut cracker has the advantages that the nut is placed into the second spring from the nut inlet-outlet port, the hammer block vertically moves in the can by vertically shaking the can, a nut shell is cracked, and the nut cannot be cracked under the action of elastic force when the hammer block touches the second spring downwards, so that a kernel cannot be cracked.