The invention discloses a method for preparing IVIG (intravenous immunoglobulin), wherein the method takes the human plasma components II+III as a starting material by a mode of low-temperature ethanol precipitation combined with ion exchange column chromatography. According to the method, dialysis, dealcoholization and desalination of feed liquid are omitted before chromatography sampling, adjustment of conductance values of the sampling feed liquid is omitted, and technological processes are greatly simplified, so that a whole process has the advantages of simple procedure, short productioncycle and high purity. IgA and IgM in an IVIG product produced by the method are greatly reduced as compared with those in products produced by a traditional process, and PKA, ACA, anti-A and anti-B hemagglutinin and polymer ratios meet pharmacopoeia provisions.