Electrocatalytic hydrodechlorination technology possesses great potential in the field of chlorinated organic compound treatment due to the high efficiency, environmental friendliness, etc. The amorphous Pd-P/polypyrrole(PPy)/foam Ni electrode was prepared by electrochemical deposition for electrochemical hydrodechlorination of the pentachlorophenol (PCP). Morphology and chemical structure of Pd-P on the PPy/foam Ni electrode was investigated by the Scanning Electron Microscope (SEM), Transmission Electron Microscope (TEM), X-ray diffraction analysis (XRD), and X-ray photoelectron spectroscope (XPS). The result indicated that the Pd-P catalyst was evenly dispersed on the PPy/foam Ni electrode with small particles and changed from crystalline state to amorphous state. The electrocatalytic reduction of PCP certificated that the doping of P significantly increased the catalytic activity of the electrode. The degradation efficiency of PCP reached 90.8% after electrocatalytic reduction for 180 min under the condition of n(Pd)/n(P)=1 : 3, Pd loading=0.15 mg/cm ², C_H2SO4=0.20 mol/L and V_cathode=-1.2 V. In addition, the Pd-P/PPy/foam Ni electrode exhibited high electrocatalytic stability after reused for 8 times without any notable deactivation.