A method for producing steel used in a titanium master alloy bonding wire by small billet continuous casting belongs to the steelmaking technical field. The process route is as follows: low-sulfur molten iron and scrap steel, converter blowing, slag blocking and tapping, steel ladle deoxidation alloying, secondary refining, complete protection continuous casting by a small billet caster and casting blank inspection. The method is characterized by controlling technical parameters of critical process links, reducing the contents of aluminum and nitrogen in the molten steel, solving the problem of submerged nozzle clogging and crystallizer protecting slag floater easily occurring at the small billet continuous casting of high titanium steel variety, and realizing the smooth production of the steel used in the titanium master alloy bonding wire by the small billet continuous casting. The method has the advantages of being capable of replacing a production process for producing the steel used in the titanium master alloy bonding wire by continuous casting of die casting and large billets, achieving 0.08-0.17% titanium content of a product and fully meeting the use requirement of the steel used in the bonding wire.