Abstract: The present invention relates to a recovering method of acetic acid using an apparatus comprising a dehydration tower, a condenser and a separation tank. As p-xylene is used as an azeotropic agent to form an azeotrope with water, which is discharged from the top of the dehydration tower, and the remaining p-xylene is discharged from the bottom of the dehydration tower along with acetic acid, the acetic acid containing the p-xylene azeotropic agent can be recycled directly to a reactor for producing terephthalic acid without further separation process and without regard to the content of the p-xylene azeotropic agent which is recovered along with acetic acid.