Underwater steel casing outer wall dredging device

The utility model discloses an underwater steel casing outer wall desilting device which comprises a lifting mechanism and a sludge removing mechanism which is connected with the lifting mechanism and used for shoveling and collecting sludge at the bottom of a steel casing, and the lifting mechanism drives the sludge removing mechanism through a crane to be attached to the outer wall of the steel casing to move up and down. According to the underwater steel casing outer wall dredging device, the lifting mechanism drives the sludge removing mechanism to ascend and descend on the outer wall of the steel casing, the sludge removing mechanism shovels and collects sludge at the bottom of the steel casing, sludge on the outer wall of the steel casing is removed, and the problem that in the existing construction technology, when a steel cofferdam in a super-thick sludge layer is subjected to underwater bottom sealing construction, the construction efficiency is high is solved. Generally, in the desilting process, de