The invention relates to an apparatus for sludge undertaking, flexible pipe extruding dehydration and transportation, and a system thereof. The apparatus comprises a frame, a material undertaking cabin, transporters, a pipeline system, a filtrate discharging system and a control system. The transporter comprises a flexible pipe filter cell, a filter cell switch mechanism and an extruding mechanism. The invention respectively discloses two work ways that: the work way 1, the material undertaking cabin is arranged on a material outlet of a dewaterer, the undertaken sludge is filled in the flexible pipe filter cell, the filter cell switch mechanism is closed, the extruding mechanism is adopted for clamping the filter cell to carry out deep dewatering, the sludge is extruded to a transportation pipe to be discharged after complete the dewatering; the work way 2, the undertaken sludge is filled in the flexible pipe filter cell through a pump, then the extruding mechanism is adopted for clamping the filter cell to carry out dewatering, the filter cell switch mechanism is opened after complete the dewatering, the dried sludge in the filter cell is extruded into the material undertaking cabin; after the amount of the sludge is stored in the material undertaking cabin, the work way 1 is performed when the sludge requires to be transported, then the dried raw materials is extruded to the transportation pipe to be discharged after carrying out the dewatering again. The material dewatering and transporting tasks are completed automatically through repeating the steps provided by the work way 1 or the work way 2.