The invention relates to a martensitic stainless steel wire rod and a production method thereof. The martensitic stainless steel wire rod is prepared from the following chemical components in weight percent: 0.30-0.65% of carbon, 0.20-0.50% of silicon, less than or equal to 0.60% of manganese, less than or equal to 0.30% of nickel, 11.50-17.00% of chromium, 0.20-0.50% of molybdenum, less than or equal to 0.25% of copper, less than or equal to 0.030% of sulfur, less than or equal to 0.040% of phosphorus, 0.02-0.20% of nitrogen, and the balance being ferrum and unavoidable impurities. The martensitic stainless steel wire rod which is excellent in surface, steady in performance and uniform in texture can be obtained by adopting the steps of smelting, casting, rolling, online hot charging annealing, salt bath, pickling, finishing to finished product inspecting and packaging, and the martensitic stainless steel wire rod has tensile strength of more than 600MPa, yield strength of more than 300MPa, elongation of more than 25%, percentage reduction of area of more than 50% and qualified product ratio of more than 85%. According to the invention, the comprehensive utilization performance of steel is improved, and the problem that surface stress cracking is easy to cause in annealing of high-carbon martensitic stainless steel in the prior art is solved on the basis of not increasing the smelting and rolling cost.