The invention provides a thermal treatment wire rod for a 2000MPa-grade cable steel wire and a production method. The thermal treatment wire rod is prepared from the following components in percentage by weight: 0.85 to 1.0 percent of C, 0.80 to 1.5 percent of Si, 0.30 to 0.80 percent of Mn, 0.20 to 0.80 percent of Cr, less than or equal to 0.015 percent of P, less than or equal to 0.010 percent of S, 0.01 to 0.08 percent of Al, and the balance of Fe and inevitable impurities. According to the thermal treatment wire rod for the 2000MPa-grade cable steel wire and the production method disclosed by the invention, through special design of the components, the wire rod is produced through processes of smelting, continuous casting, blank casting and grinding, steel rolling and off-line thermal treatment, and the sorbitizing rate of the wire rod is greater than 95 percent, tissues are homogenized, and quenching tissues such as network carbide and martensite are avoided. After the wire rod is subjected to drawing, zinc (aluminum) plating, and stabilization treatment, the strength of the steel wire is greater than or equal to 2000MPa, so that the wire rod can be used for producing the 2000MPa-grade cable zinc (aluminum) plating steel wire for bridges, and is applied to bridges requiring extra long-span and ultrahigh strength.