The invention discloses a high strength steel bar for pre-stressed concrete. The steel bar is composed of the following chemical components in percentage by weight: 0.20 to 0.25% of C, 1.50 to 1.85% of Si, 0.20 to 0.50% of Mn, 0.07 to 0.09% of Cr, 0.30 to 0.35% of Mo, 0.25 to 0.35% of V, 0.05 to 0.08% of Nb, 0.42 to 0.61% of Ti, 0.15 to 0.25% of Ni, 0.25 to 0.40% of Ca, not more than 0.025% of S, not more than 0.025% of P, not more than 0.20% of Cu, 0.15 to 0.30% of composite rare earth, and the balance being Fe. The invention further discloses a production technology of the steel bar. The production technology comprises the following steps: smelting to obtain a steel blank, rolling the steel blank, cooling the rolled steel blank, rolling the steel blank for a second time, carrying out a thermal treatment and a stabilizing treatment, performing a gas nitrogenation treatment, spinning, winding, bundling, and storing the bundles in a warehouse.