The present invention relates to a laser optical fiber used for blood vessels, and a control device thereof. The present invention is a laser optical fiber for use in a blood vessel according to an embodiment of the present invention formed of an optical fiber (1), a glass tube (2), an adhesive portion (3), an optical fiber groove (4), and a stainless tube (5). The front end portion of the stainless tube 5 and the rear end portion of the glass tube 2, which is the portion where the glass tube 2 starts, are connected through the adhesive portion 3, and the optical fiber 1 is formed at the center thereof. The glass tube 2 is inserted at the front end of the optical fiber 1 so that the front end of the optical fiber 1 is located at the front end of the glass tube 2 so that the front end of the optical fiber 2 does not directly contact the vessel wall. The optical fiber groove 4 is formed at a position in the longitudinal direction of the optical fiber 1 that matches the position of a predetermined region from the start of the glass tube 2, and the glass tube surrounding the end of the optical fiber 1. Diameter is smaller than the diameter of the stainless tube (5) from 0.1mm to 50mm The shape of the optical fiber groove 4 is formed symmetrically about the center of the longitudinal direction, the diameter of the center is the smallest, and the diameter increases toward the ends of the symmetrical type so that the optical fiber ( It is formed to match the diameter of 1), the center is vertically formed into the groove of the straight, the shape of the fan-shaped in the front and rear unfolds on both sides around the center, the surface of the glass tube (2) is polished to protect the surface It is formed by coating or coating, and the shape of the front end of the inside optical fiber (1) is cut into the shape of the horizontal direction by using a general optical fiber or by processing the end of the front end to the front to form a circular or conical shape, the laser
