The invention discloses an electric spiral slot puncher which comprises a body. A slider is arranged on the body. A servo motor is mounted at the top of the body. A small synchronous pulley is disposed on an output shaft of the servo motor and drives a large synchronous pulley through transmission of a synchronous belt. A screw is disposed on the large synchronous pulley and rotates in a screw nut. The screw nut is fixed on the slider. An indexing device is disposed below the body and comprises an indexing servo motor and a vertical centering head which is in drive connection with the indexing servo motor. A core lamination is disposed at the upper end of the centering head. A bench facing to a punch is disposed below the core lamination. The electric spiral slot puncher is compact in structure, high in flexibility, high in intelligence and smooth in operation. The position, speed and acceleration of the punch slider can be controlled, so that slotting noise is low, the service life of a punching die can be prolonged, impact and vibration of the puncher are reduced, and stop position of the punch slider is more accurate.