Multi-element alloyed ultrahigh-strength sucker rod steel and manufacturing method thereof

The invention relates to a multi-element alloyed ultrahigh-strength sucker rod steel and a manufacturing method thereof. The sucker rod steel comprises the following components in percentage by weight: 0.25 to 0.29 percent of C, 0.17 to 0.37 percent of Si, 0.50 to 0.70 percent of Mn, 0.95 to 1.20 percent of Cr, 0.18 to 0.25 percent of Mo, 0.005 to 0.025 percent of P, 0.001 to 0.025 percent of S, 0.015 to 0.050 percent of Al, 0.015 to 0.050 percent of Ti, less than or equal to 20ppm of [O], less than or equal to 3ppm of [H], and the balance of Fe and inevitable impurities. The steel has excellent comprehensive performance and long fatigue life, and is suitable for oil recovery operation of heavy and overload oil wells.