The invention discloses a continuous production method of high-purity acetylacetone, carries out azeotropic distillation with salt water to separate coarse acetylacetone liquid containing acetic acid, acetic anhydride and high-boiling product, and in such a way to continuously produce high-purity acetylacetone. The steps are as follows: in a deacidifying and deanhydriding tower T1, azeotropic mixture formed by acetylacetone and water are steamed out from the tower top, are misphased in a phase splitter S1; the water layer flows back, and the oil layer flows through the deanhydriding tower T1 and a treating column T3, thus obtaining high purity acetylacetone; the water containing cyclamate at the column bottom of the deacidifying and deanhydriding tower T1 is discharged into soda solution and a reactor R1, with the pH value of the mixture solution of 5 to 8; after flowing through a salt separator S2, the salt water with low concentration is poured into the deacidifying and deanhydriding tower T1 from the tower top; after simple recrystallization, the acetate is separated from the salt separator S2, thus obtaining high purity acetate of the byproduct. The continuous production method of high-purity acetylacetone has the advantages of continuous and steady production, little consumption, good separation effect of acetic anhydride from high-boiling products; in addition, the product purity reaches to 99.9 percent, waste water discharging is beneficial for environmental protection and the invention can be used for producing acetate byproducts.