Abstract: A flexible filamentous material cleaning device includes a spray conduit, a water pump, a suction conduit, and a vacuum pump. Spray orifices are provided on the spray conduit, suction orifices are provided on the suction conduit in a corresponding manner, and a cross-sectional area of the spray orifice is smaller than a cross-sectional area of the suction orifice. Power of the water pump is smaller than power of the vacuum pump, such that a stable fluid column directed from the spray orifice to the suction orifice is formed between the spray orifice and the suction orifice. When no flexible filamentous material is present, the fluid column is completely sucked back; when the flexible filamentous material passes through, the scattered fluid is still capable of being efficiently sucked back to form a closed loop.