The invention relates to a MCC extremely fine coaxial cable production line which is characterized in that the MCC extremely fine coaxial cable production line comprises a wire releasing device (1), a first diameter measuring instrument (2), a first tension meter (3), a preheater (4), an extruder (5), a cooling device (6), a second diameter measuring instrument (7), a second tension meter (8), an electric spark detector (9), a concave and convex extent meter (10), a longitudinal wire storage device (11), a lateral wire storage device (12), and a wire take-up device (13), the adaptive wire release is realized through the wire releasing device (1), the production stability is improved, and an extruded product is cooled well through the cooling device (6). The MCC extremely fine coaxial cable production line and a production method thereof have the advantages of a stable production working condition and good extrusion quality.