The use of solid acid as catalyst for heterogeneous catalytic biomass to prepare furfural has the advantages of easy recycling, high selectivity and green process. In this paper, a new method for the conversion of xylose to furfural by solid acid in ionic liquid is proposed. The method is environmentally friendly and the solid catalyst is easily separated from the system. The results show that among the five metal ions studied (Sn4, Ti4 +, Zr4 +, Cr3 +, Cr2 +, In3 + ), tin-supported montmorillonite catalyst (Sn-MMT) catalyzes the formation of furfural from xylose. The best performance. In addition, among the four ionic liquids studied ([OMIM]Cl[AMIM] Cl, [BMIM][HSO4], [BMIM]Cl), [OMIM]Cl has the best effect on the conversion of xylose to furfural. The THF can increase the yield of furfural. When the reaction temperature is 150°C, Sn-MMT is the catalyst, and the yield of furfural reaches a maximum after 5 minutes of reaction in [OMIM]Cl, which is 54.89%, corresponding to xylose conversion and furfural selectivity of 95.42.% and 57.52%.