Device capable of improving extending limit of coiled tubing

The invention discloses a device capable of improving the extending limit of coiled tubing. The device is provided with a vibrating pipe nipple and a modulating pipe nipple. The upper end of the modulating pipe nipple is provided with an internal thread and connected with the lower end of the vibrating pipe nipple, and the lower end of the modulating pipe nipple is provided with an external thread and connected with a lower drilling assembly. Static friction between the coiled tubing and a well wall can be converted into sliding friction through device axial vibration, friction resistance between the coiled tubing and the well wall is lowered, and the extending limit of the coiled tubing can be improved. Rock debris can be promoted to move through device axial vibration, a rock debris bed is prevented, a borehole is smoothened, and downhole complexity is avoided; it is guaranteed that fluid always passes through the device through an impeller with a through hole, using of downhole motors and measuring tools cannot be affected, and meanwhile the damage effect of water attack is prevented. The device is simple in structure, the number of the components is small, and reliability of the device is guaranteed.