Abstract: In this paper, the regenerated chrome tanning agent A-CP and AH-CP were prepared by spray drying after the treatment of tanning sludge with acid leaching and acid leaching-H₂O₂ methods, respectively. The experimental results showed that the apparent color of AH-CP obtained by the acid leaching- H₂O₂ method was greenish compared with the direct acid-soluble A-CP, and the content of water insoluble matter was reduced, and the hydrolysis performance was close to that of Jinshan chrome powder T-AB. The tanning test shows that AH-CP has good tanning performance; the colorimetric color difference analysis of wet blue leather shows that the color of the AH-CP tanned leather is improved and close to the T-AB tanned leather; the Ts and physical mechanical properties of three kinds of wet blue leather can meet the standard for shoe upper leather.