Purification method of CsBr

The invention provides a CsBr purification method, and belongs to the technical field of CsBr purification, the purification method comprises the following steps: recrystallizing CsBr to be purified to obtain recrystallized CsBr; the recrystallized CsBr is subjected to directional solidification, and CsBr obtained after directional solidification is obtained; the CsBr obtained after directional solidification is subjected to zone melting, and high-purity CsBr is obtained; the purity of the high-purity CsBr is greater than or equal to 8N. According to the purification method, a recrystallization technology, a directional solidification technology and a zone melting technology are combined, and through cooperation of the three technologies, impurity phase pollution such as Cs2O and CsOH in low-purity CsBr can be effectively removed, the purity of CsBr is greatly improved, and high-purity CsBr capable of being used for growth of high-crystal-quality single crystals is prepared. 本发明提供了一种CsBr的提纯方法，属于CsBr提纯技术领域，所述提