This investigation focuses on the preparation of polypyrrole composite films, Ppy/Al2O3/Al, used as solid-state capacitor with electrochemical polymerization in the presence of DBSA, co-dopant and co-solvent. The parameters of the solid-state capacitor, i.e. leakage current (Lc), capacitor (Cs), dicipation factor (DF) and equivalent series resistance (ESR), were measured in this study. The surface morphology and compositions of the prepared Ppy/Al2O3/Al electrolyte were examined using SEM and EDS, respectively. Further, for 3C of electricity passed, the values of Lc, Cs, DF and ESR of the Ppy/Al2O3/Al capacitor prepared with 2-NSNa and DBSA as a co-dopant were measured to be 0.029±0.005μAcm−2, 688.8±8.28nFcm−2, 14.35±5.63% and 18.63±3.48Ω. Further, the parameters both of R ox and R ppy are 135.5 and 7.047Ω.