The invention relates to an electric gate opener. The electric gate opener is internally provided with a transition gear, a second rotating shaft is arranged in the transition gear, a coaxial apical-tooth gear is arranged on the outer side face of the transition gear, one end of the second rotating shaft is a hollow cylinder, a notch is formed outside the hollow cylinder of the second rotating shaft, the notch penetrates through the second rotating shaft, and a spring is arranged in the notch; one end of the spring abuts against the bottom of the hollow cylinder, the other end of the spring abuts against the side face of a cross rod which is perpendicular to the spring, and the two ends of the cross rod penetrate through the notch which penetrates through the second rotating shaft to be place in corresponding grooves in the inward side faces of the transition gear; the transition gear is connected with the coaxial apical-tooth gear through three fixed connecting bolts, the inner wall of the hollow cylinder is provided with an inner thread, and a cylindrical bolt provided with an outer thread corresponds to the inner thread in the inner wall of the hollow cylinder; and one end of the cylindrical bolt is a stretched ejector rod, the head of the stretched ejector rod abuts against the side face of the cross rod, and the other end face of the cylindrical bolt is provided with a hexagonal wrench opening.