The utility model relates to a device for manufacturing a coated optical fiber which has resin-coated excellent surface flatness, and coloured ink is coated with excellent coated performance. The device for manufacturing the coated optical fiber (10) comprises a drawing furnace (2) which is used for melting an optical fiber prefabricated stock (1) and forms a bare optical fiber (3), a cooling system (5) which is used for cooling the formed bare optical fiber, a resin coated system (8), a resin coated bare optical fiber which is used as an outer coating of the coated optical fiber, a curing system (9) which is used for curing resin and a pulley wheel which is arranged on a passage of a wire winding device (14), which the coated optical fiber is transmitted to, wherein, the surface roughness of every solid which contacts an outer layer of the running coated optical fiber is equal to or less than 0.8 mum, when the temperature of an outer coating is room temperature or the Young's modulus of the outer coating is higher than 500MPa, the surface roughness of every solid which contacts the outer layer of the coated optical fiber is equal to or less than 1.2 mum.