The invention provides a method for producing a cold-pressed block for a converter by utilizing iron in blast-furnace slag. According to the method, blast-furnace slag iron, gas silt or gas ash and iron scale are used as raw materials, binders are matched, and the raw materials and the binders are uniformly mixed for 15 minutes to 25 minutes by a mixing mill, then are pressed and formed by a cold pressing molding machine and are naturally placed outdoors for 10 to 48 hours after wet curing, so that the cold-pressed block is prepared. The prepared cold-pressed block comprises the following components in parts by mass: 30 parts to 60 parts of blast-furnace slag iron, 20 parts to 30 parts of gas silt or gas ash, 20 parts to 50 parts of iron scale and 8 parts to 17 parts of binders. Compared with the prior art, the method has the beneficial effects that after the cold-pressed block prepared by using the method is naturally placed outdoors for 20 to 48 hours after wet curing, the requirement of the intensity of the metallurgical cold-pressed block can be fully satisfied; the cold-pressed block is used for the converter, so that a part of steel scrap can be replaced; and the blast-furnace slag iron is efficiently recycled in a short process and with low energy consumption.