A locking device on the striker of double-cylinder electric nail gun, including a gear box, a union joint, a mobile hole; the union joint is connected to a first cylinder; the right sidewall of the gear box is provided with a second cylinder connected to the inner space thereof, the second cylinder is located normally under the first cylinder; a matched first piston is located in the first cylinder, a matched second piston is located in the second cylinder; the first piston is connected to a striker; the front of the striker penetrates through the mobile hole to the outside, the front of striker exposed to the outside is provided with several notches; an eccentric shaft seat is located in the gear box, one side of the eccentric shaft seat is provided with an eccentric shaft.