Method and device for dragging out roller used for dragging steel rail below steel rail

The invention discloses a method and a device for dragging out a roller used for dragging the steel rail below a steel rail, and the method comprises the following steps: arranging lifting and sliding mechanisms on two sides of a roller recovery vehicle, lifting a section of steel rail of which two sides are pressed on the roller by the lifting and sliding mechanisms, and enabling the lifting and sliding mechanisms to slide forwards along with the vehicle on the bottom surfaces of rail heads on two sides of the steel rail; and meanwhile, a dragging device which can move forwards and backwards on the roller recovery vehicle and can drag the roller out of the bottom of the steel rail is arranged on the roller recovery vehicle, and the dragging device moves backwards on the roller recovery vehicle when the roller recovery vehicle moves forwards during operation. And the dragging device and the ballast bed are kept relatively static for a period of time, the dragging device completes the action of dragging the ro