The invention discloses a method for refining an acetone solvent used for polyphenylene sulfide preparation and an application thereof. The method comprises the following steps: 1) performing adsorption treatment on a to-be-processed solvent by employing acidic ion exchange resin to obtain the pre-treated acetone solvent; and 2) performing alkalization treatment on the pre-treated acetone solventto obtain the refined acetone solvent. The obtained acetone solvent prevents weak alkalinity and has low methylamine content, and wire fracture phenomenon is reduced during spinning when the acetone solvent is used for washing polyphenylene sulfide.