The invention provides a biomass iron-containing block mass short-course steel-making method and a biomass iron-containing block mass stainless steel production method and belongs to the technical field of ferrous metallurgy. The steel-making method comprises the following steps: step I, producing direct reduction iron: iron-containing block masses are placed in a high-temperature container to be heated, and a ferric oxide is reduced to generate direct reduction iron; and step II, smelting in an electric furnace: direct reduction iron is hot-charged and fed into the electric surface, a slag former is added into the electric furnace, and steel is discharged after oxygen blowing smelting. The biomass iron-containing block mass stainless steel production method is characterized in that molten steel is added into an AOD furnace to be decarbonized and heated, a chromium-containing metal raw material is added into the furnace for alloying, and molten steel is conveyed into a VOD furnace for deep decarbonization to obtain stainless steel. The iron-containing block masses are reduced to generate direct reduction iron, and direct reduction iron is hot-charged and fed into the electric furnace to be smelted to obtain qualified molten steel, so that short-course steel-making of the biomass iron-containing block masses is realized, and the energy utilization efficiency is improved; and stainless steel can be further produced through smelting.