The invention relates to a converter slag iron furnace-protecting technology, belonging to the field of metallurgy technology. According to the technical scheme, the converter slag iron furnace-protecting technology comprises the step as follows: 1. all converter slags are kept after molten steel in a converter is completely discharged; 2. then the converter is inclined towards the front of a converter lining, prepared pig irons are poured in the converter slag at a constant rate by using a crown block, at the same time, the converter is downward rocked so as to increase the inclination degree of the converter and enable the pig irons to be evenly distributed in the front of the converter lining; and 3. after the pig irons are poured in the inclined converter, the converter stays at the position for one minute, and then the converter is upward rotated to be in a perpendicular direction to start splash protection. According to the converter slag iron furnace-protecting technology, the converter slag and steelmaking cold pig irons are utilized, and the functions that the converter slags are cooled and separated out and condensed and adhered on the converter lining with high melting point phase are fully played, so that the effect of maintaining the converter lining is achieved, the production operation rate of the converter is improved, the economic converter life is prolonged, the labor intensity is lightened, the operation environment is improved, the resource utilization efficiency can be increased, and the negative influence on the first converter steel melting and molten steel quality after fettling can be eliminated.