The invention discloses a modified guanidine gum postprocessing technology. The modified guanidine gum postprocessing technology includes the specific steps of 1, primary washing, wherein methanol and water are compounded in the volume proportion of 4:1 to form detergents MW-1; 2, secondary washing, wherein methanol and water are compounded in the volume proportion of 9:1 to obtain detergents MW-2; 3, tertiary washing, wherein methanol, cetyltrimethylammonium chloride serving as surfactants and water are compounded in the volume proportion of 8:1:1 to obtain detergents MWT-3, and modified guanidine gum is washed three times through the MWT-3 under the conditions of the temperature of 40 DEG C to 50 DEG C and the washing time of 10 minutes to 20 minutes. The modified guanidine gum postprocessing technology has the advantages that the swelling speed of the modified guanidine gum is greatly increased, so that in the postprocessing process of the modified guanidine gum, the aim of reducing the content of residues can be achieved, and the swelling speed of the modified guanidine gum can be increased.