The present invention relates to an underwater creeping dredging equipment, consisting of five portions of oil distributing tray, forward limit module, main propolsion module, pull-back limit module and dreging drill bit. All the portions are connected by means of connecting bolts and connecting screws. in which forward limit module and pull-back limit module possess limit oil cylinder structure,its main propulsion module possesses main propulsion cylinder, its oil-returning circuit and oil-feeding circuit are communicated with oil-feeding circuit and oil-returning circuit in the pull-back limit module. Said invented equipoment can be substituted for diver to make underwater automatic dredging operation.
