The invention discloses a method for preparing a ZSM-5 hollow molecular sieve through hydrothermal recrystallization and relates to a method for preparing a molecular sieve. The method includes the steps that firstly, a silicon source, an aluminum source and a certain amount of deionized water are added into an organic template agent under the stirring condition, placed in a reaction kettle and crystallized for 5-7 d at 175 DEG C, a reaction product is washed and dried, and the ZSM-5 molecular sieve can be obtained; secondly, the obtained ZSM-5 molecular sieve is re-crystallized, the product is washed and dried, and finally the ZSM-5 hollow molecular sieve is obtained. The high-crystallinity ZSM-5 hollow molecular sieve synthesized through the hydrothermal recrystallization method is short in crystallization time. Synthesized ZSM-5 hollow crystals maintain good characteristics of an original ZSM-5 molecular sieve, keep good crystallinity and purity and have good catalytic reaction activity. Meanwhile, the ZSM-5 hollow molecular sieve has few framework defects, and plays an important role in inactivation research in a catalysis reaction and prolonging of service life.