The invention provides a device for realizing automatic switching of a falling protector between a transverse rail and a longitudinal rail, and particularly relates to an anti-falling rail switcher. The anti-falling rail switcher comprises a vertical plate with a rotatable turn-plate arranged in the middle, a rail switching guide block is fixed on the turn-plate, and the left, right, upper and lower ends of the vertical plate are fixedly connected with an anti-falling rail respectively. The anti-falling rail switcher is skillful in design and simple in structure and realizes automatic switching of the falling protector between the transverse rail and the longitudinal rail; since rail switching is realized in a smooth and quick manner without any protection dead zone, operators cannot be distracted during rail switching, and safety grade of falling protection devices is increased further.