The invention discloses a method for increasing the yield of 2'-fucosyllactose in recombinant escherichia coli, and belongs to the technical field of gene engineering. According to the method, four different protein labels are fused at the N ends of alpha-1, 2-fucosyltransferase FutC respectively by adopting flexible Linker, and the constructed fusion protein FP-futC can improve the yield of 2'-FLcatalyzed and synthesized by alpha-1,2-fucosyltransferase to different extents. The yield of the 2'-FL synthesized by adopting the TrxA-futC fusion protein is the highest and reaches 2.94 g/L, the consumption of substrate lactose reaches 3.55 g/L, and the lactose conversion rate is 0.58 mol/mol. In the control group, the yield of the 2'-FL synthesized by the recombinant escherichia coli obtainedby plasmid pMA09-futC constructed without protein tags is only 1.71 g/L, the lactose consumption is 2.88 g/L, and the lactose conversion rate is only 0.42 mol/mol. Furthermore, the TrxA-futC fusion protein gene is integrated to a yjiP site on an escherichia coli MG1655 genome to obtain a plasmid-free 2'-FL genetically engineered strain MG-26 delta yjiP:: trxA-futC, the yield of the 2'-FL after shake-flask fermentation reaches 3.85 g/L, and the lactose conversion rate is 0.68 mol/mol.