The invention relates to the production field of microorganism fermentation, in particular to a post extraction method of transparent xanthan gum, comprising the processing steps of pretreatment of fermentation broth, first extraction, first centrifugation, second extraction, second centrifugation, third elution, third centrifugation, drying and the like. The invention solves the problems that inthe prior art, the prepared xanthan gum has poor transmittance and is not applicable to industries which have higher demand on the transmittance of the xanthan gum; the invention further solves the defects that in the prior art, no post extraction technology exists, and the packaging, transportation and application of the products are all inconvenient and problematic; the invention has the advantages of reasonable design of the whole technology, high transmittance of the prepared xanthan gum, convenient application of products and the like.