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This utility model relates to the technical field of dredging devices, and in particular to a river silt sluice-type crushing device, which can adjust the shape of the crushing head according to the hardness of the silt, and has good adaptability; it includes a sluice pipe and a drive shaft, the drive shaft being rotatably mounted in the sluice pipe; it also includes a cutter disc, a push cylinder, two bearing seats, a hinge plate, multiple inner cutter rods and multiple outer cutter rods, the cutter disc being rotatably mounted on the input port of the sluice pipe, the drive shaft being connected to the cutter disc via a transmission assembly, the fixed end of the push cylinder being concentrically rotatably mounted on the cutter disc via a bearing seat, the hinge plate being rotatably mounted on the piston rod end of the push cylinder via another bearing seat, one end of the multiple inner cutter rods being rotatably connected to the cutter disc, the other end of the multiple inner cutter rods being rotatably connected to one end of the multiple outer cutter rods respectively, the other end of the multiple outer cutter rods being rotatably connected to the hinge plate evenly, and the multiple inner cutter rods and multiple outer cutter rods being evenly arranged circumferentially.