The invention discloses a system for reducing steel water consumption in a steelmaking process. The system comprises a converter, a first packing device, a second packing device, a scrap steel alloy feeding device and a heating agent feeding device; the first packing device can move back and forth between a first charging position and a feeding position; the second packing device can move back andforth between a second charging position and the feeding position; the scrap steel alloy feeding device is used for feeding the first packing device; the first packing device and the second packing device are each provided with a weight sensor; the heating agent feeding device is loaded with a heating agent; a slag blocking plate is further arranged on the converter; a plurality of reinforcing ribs are arranged on the inner side of the slag blocking plate; and a plurality of protruding steps are further arranged on the surface of the slag blocking plate. By arranging the heating agent feedingdevice, molten iron consumption can be effectively reduced by adding the heating agent into the converter, in addition, the first packing device and the second packing device are arranged, the weightsensor are arranged, and thus the proportion of scrap steel to the heating agent can be accurately controlled.