The invention relates to a method for separating and purifying a 2-methylimidazole crystal impurity. The method comprises the following steps: 1) dissolving the 2-methylimidazole crystal impurity by thermal benzene at a temperature of between 40 and 80 DEG C for 30 to 60 minutes, filtering the mixture to obtain filtrate; 2) passing the filtrate, adsorbing and decoloring the filtrate through activecarbon, refiltering the filtrate, and crystallizing the obtained filtrate at low temperature to obtain crystal; and 3) centrifugally separating the crystal, and drying the crystal at a temperature ofbetween 40 and 50 DEG C under a vacuum condition for 1 to 4 hours to obtain crystal 2-methylimidazole. The method has the advantages that the benzene as solvent and the active carbon as a decoloringagent are adopted to remove color elements in a crude product without concentration, the separating and purifying method has few steps, accessible raw materials, simple process, easy realization, lowenergy consumption and high yield. The benzene can be recycled without distillation, and the 2-methylimdazole is white acicular crystal, has high purity, good chromaticity, melting point of between 137 and 141 DEG C, purity over 92 percent, and the yield reaching over 70 percent.