The invention discloses a coiled tubing safety mechanism. The coiled tubing safety mechanism comprises a supporting base, a left arm, a right arm, a left drilling slip and a right drilling slip, the middle of the left arm is hinged to the supporting base through a left pin roll, the middle of the right arm is hinged to the supporting base through a right pin roll, the left drilling slip is installed at the front end of the left arm, the right drilling slip is installed at the front end of the right arm, the left arm and the right arm are symmetrically arranged, the left drilling slip and the right drilling slip are symmetrically arranged, and the rear end of the left arm and the rear end of the right arm are hinged to a driving device simultaneously. By means of the coiled tubing safety mechanism, a tubular column can be quickly and tightly held when an injector breaks down, and a coiled tubing is prevented from falling to a well. Technical guarantee is provided for safe operation of the continuous oil tubing (or a compound tubing).