The invention discloses a method for extracting inulin by medium-low-temperature water. During raw material preprocessing, a color retention agent is added; extraction is carried out under the condition of medium-low-temperature water; the squeezing is carried out for many times by a belt type squeezing method; the occurrence of a Maillard reaction can be effectively inhibited; an active carbon decoloration process is not needed; the inulin loss in the inulin process is avoided; the yield of the inulin is improved; the production process is also simplified; the production cost is reduced. Compared with a spiral squeezing method, the belt type squeezing method has the advantages that the juice yield is improved; the operation is simple; the inulin extraction rate can reach higher than 95 percent; the color of the finally obtained inulin is pure; the purification is high; the energy consumption is reduced; the integral economic benefits are higher.
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