The invention relates to a method for purifying crude indium through vacuum distillation and multistage condensation and belongs to the technical field of indium purifying. The method comprises the steps that the crude indium is smashed into small-block-shaped crude indium, and a condensation device is placed at the top of the small-block-shaped crude indium; the vacuum degree is controlled to be 10-20 Pa; then, the temperature is raised from 25 DEG C to 400 DEG C at the rate of 5-10 DEG C/min, the temperature is raised from 400 DEG C to 1100 DEG C at the rate of 5-10 DEG C/min, and the temperature is raised from 1100 DEG C to 1350-1450 DEG C at the rate of 1-5 DEG C/min; primary distillation is conducted for 20-60 min under the condition that the temperature is 1350-1450 DEG C; after distillation is completed, the temperature is reduced to be 150 DEG C or lower; and high-purity indium is condensed on the middle layer of the condensation device. The method has the characteristics that as metal condensation temperatures are different, impure metal and the indium are condensed in different dishes through multistage condensation correspondingly; and accordingly, the purpose that impurity elements in the crude indium are removed, and the metal indium is purified is achieved.