Optical fiber end fixing structure and optical fiber end fixing method

The invention discloses an optical fiber end portion fixing structure and an optical fiber end portion fixing method, the optical fiber end portion fixing structure comprises an insertion core assembly, a substrate and a bonding assembly, the insertion core assembly is cylindrical, the axis of the insertion core assembly is provided with a through hole used for accommodating an optical fiber, the substrate is provided with a fixing groove, and the bonding assembly is provided with a bonding groove. Two wall bodies of the fixing groove extend in the axial direction of the insertion core assembly, the distance between the two wall bodies is smaller than the diameter length of the insertion core assembly in the radial direction, the peripheral face of the insertion core assembly is in line contact with the vertexes of the two wall bodies, the fixing groove is filled with the bonding assembly, and the bonding assembly is connected with the fixing groove and the insertion core assembly. According to the optical fi