To meet the composite addition requirements of a novel soft filter rod, a feeding mechanism is designed, which mainly consists of a filter rod fork, a mechanical gripper, and an inclined plane-guide rod mechanism. Transient dynamics analysis was performed using ANSYS Workbench software to simulate the mechanical behavior of the soft filter rod, while fatigue life analysis was conducted on the spring structure within the mechanism. The results show that the maximum equivalent stress of the soft filter rod is 8.3563 MPa, less than the allowable stress (33 MPa) of its PLA material, indicating no damage during feeding. Under actual working conditions, the spring exhibits minimal fatigue damage, with a maximum equivalent alternating stress of 526.91 MPa, below its allowable stress (786 MPa), further verifying the reliability of the mechanism. The designed feeding mechanism thus satisfies both structural and performance requirements for composite addition of soft filter rods.