The invention provides a smelting method for reducing unit consumption of converter flux. The method is characterized in that active lime and light-burned dolomite are added after converting for 1min,and a slag melting agent is added synchronously; the converting is performed for 1-3min under the oxygen supply intensity of 2.5-2.8Nm<3>/min, and the oxygen lance height is 1900-2200mm; the oxygen lance height is 2400-2900mm if the converting is performed for being beyond 3-5min; an oxygen lance is held for slagging off after converting for 5-8min; after the oxygen lance is held 1.5-2.5m away from a furnace port, the slag surface is purged for 20-50s with nitrogen; slagging off is carried out for 3-5min after nitrogen purging, and the minimum slagging-off angle is 91 degrees; a converter istilted to an zero position for blowing oxygen again after slagging off; the active lime and the light-burned dolomite are added by two to four batches after converting again; the oxygen lance height is controlled to be 2200-2800mm; 0.8-1.5kg/t of slag melting agent is added while the flux is added. With the adoption of the method, the slagging effect can be effectively improved; the unit consumption of the active lime and the light-burned dolomite can be correspondingly reduced by 11kg/t and 6kg/t while the requirements on hot metal component and temperature control are met.