The invention belongs to the field of granulating waste chemical fiber filaments and discloses a cutting device for granulating waste chemical fiber filaments. The device comprises a base, and a conveying mechanism and two vertical plates are fixed to a top end of the base. The conveying mechanism is between the two vertical plates, an adjusting frame is arranged above the conveying mechanism, andracks are fixed on inner walls of two sides of the adjusting frame. A top plate is fixed to the tops of the vertical plates, a baffle plate is fixed to a side of a bottom end of the top plate, one side of the baffle plate is equipped with a servo motor, and an incomplete gear is fixed to an output shaft of the servo motor and is between the two racks. A partition plate is fixed to a bottom end ofone side of the baffle plate, and two vertical rods are fixed to a bottom end of the adjusting frame. The cutting device has the advantages of ingenious design, reasonable structure and simple operation, the smooth transmission of the waste chemical fiber filaments is facilitated, labor is saved, the intermittent and reciprocating cutting of the waste chemical fiber filaments can be performed, the generation of uniform particles which are convenient for subsequent processing is facilitated, the practicability is high, and the cutting device is suitable for popularization.