The invention discloses a 500 MPa stage anti-knock rebar and a reduction production method thereof. The rebar comprises chemical components including, by mass percentage, 0.22%-0.25% of C, 1.30%-1.50%of Mn, 0.40%-0.50% of Si, 0.055%-0.065% of V, 0.20%-0.25% of Cr, not larger than 0.030% of S, not larger than 0.035% of P, 0.022%-0.025% of N and the balance Fe and inevitable impurities. The reduction production method comprises the steps of smelting, refining, continuous casting and rolling. According to the method, bottom blowing of nitrogen is carried out in the whole refining process, the high-strength hot rolling rebar with the high yield strength, the high tensile strength and high elongation is produced through molten steel nitrogen enriching treatment, the rebar is used for constructional engineering, rolled steel is saved, the structural strength is increased, the safe reserve is increased, and the building safety is improved; and meanwhile, the using amount of microalloy element V is small, and the production cost is greatly reduced.