The invention relates to a multistage fluidized bed which is used in hematite prereduction process and formed by at least two stages of fluidized beds sequentially connected in series. The raw materiaThe invention relates to a multistage fluidized bed which is used in hematite prereduction process and formed by at least two stages of fluidized beds sequentially connected in series. The raw materiaused by over-high temperature of coal gas in the existing multistage fluidized bed prereduction process, reduces the pressure loss of the gas distribution plate in the multistage fluidized bed, and iaused by over-high temperature of coal gas in the existing multistage fluidized bed prereduction process, reduces the pressure loss of the gas distribution plate in the multistage fluidized bed, and improves the working efficiency of fluidized bed hematite prereduction process, thereby improving the efficiency of smelting reduction process by the whole 'two-step method'.mproves the working efficiency of fluidized bed hematite prereduction process, thereby improving the efficiency of smelting reduction process by the whole 'two-step method'.l of hematite is put in the first stage fluidized bed from a storage bin, high temperature coal gas taken as fluidizing medium and reaction medium is led into from the bottom of the last stage of fluil of hematite is put in the first stage fluidized bed from a storage bin, high temperature coal gas taken as fluidizing medium and reaction medium is led into from the bottom of the last stage of fluidized bed; the raw material of hematite goes downstream by gravity, the high temperature coal gas goes in a reverse direction with the hematite, and the hematite is reduced step by step in the multistdized bed; the raw material of hematite goes downstream by gravity, the high temperature coal gas goes in a reverse direction with the hematite, and the hematite is reduced step by step in the multistage fluidized beds; the hematite is reduced by the multistage fluidized beds or added directly into a final reduction furnace by gravity, or sprayed into the final reduction furnace by a spraying gun;age fluidized beds; the hematite is reduced by the multistage fluidized beds or added directly into a final reduction furnace by gravity, or sprayed into the final reduction furnace by a spraying gun;and the fluidized bed is provided with at least two tapers, and is a tapered fluidized bed without a gas distribution plate. The invention solves the problem of smelting and bonding of raw material c and the fluidized bed is provided with at least two tapers, and is a tapered fluidized bed without a gas distribution plate. The invention solves the problem of smelting and bonding of raw material ca