PURPOSE: To simply and effectively recover a noble metal from an aqueous soln. contg. a complex of the noble metal when the noble metal is extracted with an extracting reagent contg. phosphorous, by using a specified accelerating agent so as to increase the rate of extraction.

CONSTITUTION: When a noble metal is transferred from an aqueous soln. contg. a complex of the noble metal to an org. phase of an extracting reagent contg. phosphorus by solvent extraction, alkyloxime is added to a conventional solvent. Since the alkyloxime has accelerating action on the extracting reagent, the rate of extraction can be remarkably increased and the noble metal in the soln. can be effectively recovered by simple repetitive operations. The alkyloxime added is represented by a formula R-CH=N-OH (where R is alkyl, preferably 4W10C alkyl).