The invention discloses an optical fiber fixing device. The device comprises a base and an annular cylinder table, wherein the annular cylinder table and the base are mutually connected; the outer circumferential side of the cylinder table is provided with a plurality of optical fiber locating parts in sequence along the circumferential direction; the base is provided with grooves; and an optical fiber is wound on the cylinder table through the grooves along the optical fiber locating parts. The optical fiber is wound on the cylinder table through the grooves in the base along the optical fiber locating parts, and thus, the process of processing round spiral grooves in the cylinder table is not needed, and moreover, the phenomenon that the optical fiber is damaged due to the fact that the round spiral grooves are not processed well is also avoided. Such an optical fiber fixing method is simple and reliable and is easy in processing and convenient to install and fix. The optical fiber is regularly wound, is tightly fitted with a fitting surface and is not twined with each other, and the heat dissipation efficiency is high.