The utility model provides an online compensation device of a vibrating feeder. The online compensation device comprises an electric gate valve and the vibrating feeder, wherein a discharging port in the bottom end of the electric gate valve is connected with the top end of an outer casing, an inner casing is installed inside the outer casing, the bottom end of the inner casing is connected with a feeding port at the top end of the vibrating feeder, the side wall of the inner casing is provided with a plurality of inner strip-shaped holes, all the inner strip-shaped holes are uniformly distributed along the periphery of the side wall of the inner casing, outer strip-shaped holes are formed in the positions corresponding to the inner strip-shaped holes in the side wall of the outer casing, the length directions of the inner strip-shaped holes and the outer strip-shaped holes are parallel to the central axis direction of the inner casing, a fastening bolt is arranged in each inner strip-shaped hole, and the fastening bolts pass through the inner strip-shaped holes and the outer strip-shaped holes and then are connected with nuts. The online compensation device can be used for compensating the distance between the vibrating feeder and the electric gate valve, effectively shortening the construction time for erecting dry quenched coke discharging equipment, and ensuring that a connecting structure between the vibrating feeder and the electric gate valve cannot be broken after the dry quenched coke discharging equipment is started up.