The invention relates to the technical field of blast furnace iron-making technologies, specifically to a borax-containing agglomerate surface additive. The borax-containing agglomerate surface additive contains the following components of: by weight, 0.01-10% of borax and the balance being water. By sprinkling the additive provided by the invention on the surface of agglomerate lump ore or pellet ore, surface performance of the agglomerate lump ore or pellet ore is effectively improved, and low temperature efflorescence rate of the agglomerate is reduced. When used in blast furnace iron-making, the additive can endow the agglomerate with enough strength and permeability at the temperature of 500 DEG C and can make the agglomerate generate no adverse impact on the operation of the blast furnace and the iron quality. The additive absolutely contain no chloride, thus effectively inhibiting corrosion of blast furnace lining, furnace lining refractory materials and blast furnace gas cooling and recovery devices. Therefore, the invention is beneficial to environmental protection.