The invention discloses a device for improving the lime dissolution rate. The device comprises a lime charging hopper (1), a first discharging pipe (2), a second discharging pipe (4) and a steel ladle (5) which are sequentially connected; an argon bottom blowing pipe (6) is further arranged at the bottom of the steel ladle (5); and the first discharging pipe is internally provided with a plurality of discharging buffer rolling shafts (3) sequentially arranged in the lime discharging direction. Through the above design, the lime charging hopper, the first discharging pipe, the second discharging pipe and the steel ladle are sequentially arranged, the multiple discharging buffer rolling shafts are sequentially arranged in the first discharging pipe in the lime discharging direction, and in the lime discharging process, argon flow is blown out through the argon bottom blowing pipe arranged at the bottom of the steel ladle to assist in stirring of lime, so that the good dissolution effect on the lime is achieved. Through the above design, electrification electrode disconnection accidents are avoided, consumption of electrodes is reduced, the refine period of an LF furnace is stabilized, the blank casting quality is improved, and normal implementation of production is guaranteed.