Novel conductive polymer aluminum solid electrolytic capacitors were fabricated using DC etched aluminum foil and various polyhydric alcohols, such as erythritol, sorbitol, and polyglycerol (PG), as secondary dopant to improve electrical conductivity of poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS). It was found that both excellent capacitor characteristics and breakdown voltage were obtained by filling the low resistance PEDOT:PSS into the etching pit of the aluminum foil, where equivalent series resistance (ESR), capacitance usable rate (C.R.), and breakdown voltage of the capacitor fabricated using the PEDOT:PSS containing 96.5 wt% of PG were 0.023 Ω, 89%, and 210 V, respectively. The results indicated that the filling state of PEDOT:PSS and polyhydric alcohol inside the etching pit was crucially important for the capacitor characteristics and breakdown voltage of the PEDOT:PSS aluminum solid electrolytic capacitors.