Crew should replace the worm-out cutter teeth in time to ensure the continuous construction of ships,and the replacement of cutter teeth mainly depends on manpower or special equipment.According to the construction characteristics of the cutter and combining with the related design drawings of the ship,we design the technical scheme of dismounting and hoisting device.By means of relevant calculation,we analyze and demonstrate the feasibility of this technical scheme.The lifting device is successfully applied to dredging construction site,which solves the problem of disassembly and installation of heavy cutter teeth that cannot be competent by manpower,and improves ship performance.It can provide references for the similar projects.