The invention belongs to the field of compound purification, and particularly relates to a method for recrystallizing and purifying 2,3,6-trichloropyridine, aiming at providing a novel method for purifying 2,3,6-trichloropyridine, which is simpler and more effective and has lower cost. The method comprises the following steps: mixing a 2,3,6-trichloropyridine crude product with a solvent in a solid-liquid mass ratio of 1:(1-4); heating until solid is completely solved, and cooling to 10-30 DEG C; and crystallizing, filtering and drying to obtain the 2,3,6-trichloropyridine. According to the preparation method, the purity of 2,3,6-trichloropyridine is increased by 3-15 percent by controlling a recrystallizing solvent and dosage thereof, crystallizing temperature and other parameters in the recrystallizing process, and the recrystallized finished product has high purity and high yield. The method has simple operation, high recrystallization efficiency and low cost, and provides an efficient means for purifying the 2,3,6-trichloropyridine.