The invention provides a scraper loader supporting device. The scraper loader supporting device comprises a column casing, a movable column, a column lock, a horizontal wedge, a sliding block and a top connecting component. The column lock is arranged on the column casing and provided with a connecting hole allowing the horizontal wedge to penetrate through. The sliding block is located in the column lock. The surface, making contact with the horizontal wedge, of the sliding block is provided with a groove. The horizontal wedge is trapezoid. When the horizontal wedge is not inserted tightly or not inserted in the connecting hole, the upper end of the sliding block does not make contact with the movable column, and an inclined angle is formed between the sliding block and the vertical direction; when the horizontal wedge is inserted tightly, the working surface of the horizontal wedge pushes the upper end of the sliding block to rotate leftwards to compress the sliding block, and the sliding block, the horizontal wedge, the column lock and the movable column are connected through friction force. When the horizontal wedge is inserted in the through hole and compresses the sliding block, the sliding block rotates leftwards to make surface contact with the surface of the movable column and is compressed, the friction force is produced under the action of mutual extrusion of the sliding block, the horizontal wedge, the column lock and the movable column, and therefore the movable column is supported and is prevented from sliding downwards.