Mud scraping plate lifting device

The utility model belongs to an accessory device of a joist barrow type suction dredger, and particularly relates to a scraper lifting device. Comprising a support capable of moving along with the truss type suction dredger. The upper end of the guide sleeve is closed, the outer wall of the guide sleeve is assembled on the truss type suction dredger, the supporting rod is linearly matched with the inner wall of the guide sleeve, a first spring is arranged between the guide sleeve and the supporting rod, the lower end of the supporting rod extends out of a lower port of the guide sleeve and is connected with a mud scraper support, and the lower end of the mud scraper support is connected with a mud scraper. Walking wheels are arranged in the middle of the pool wall and matched with a guide rail arranged on the pool wall, the guide rail comprises a lifting rail, a horizontal rail and a descending rail which are connected end to end, a gap allowing the walking wheels to pass through is formed in the tail end of