The separation characteristics of palladium (Pd) from a simulated radwaste solution by ascorbic acid was investigated. Pd was selectively precipitated by the reduction reaction of Pd with ascorbic acid. For a 1-component system with only Pd, over 99.9% Pd was precipitated at ascorbic acid concentrations above 0.025 M. When the nitric acid concentration in a 7-components system (Pd, Rh, Ru, Fe, Mo, Cs, Sr) was below 2.0 M, Pd over 99.5% was selectively precipitated at an ascorbic acid concentration above 0.06 M while the other elements mainly remained in the solution. As the nitric acid concentration in the simulated solution increases, the precipitation yields of Pd decrease. Pd precipitates formed by ascorbic acid were confirmed as Pd metal from XRD analysis results.