MXene, being a unique two-dimensional nanomaterial, has the advantage of large spacing and conductive layered structures, providing great potential for enhancing the electrochemical properties of supercapacitors. However, the van der Waals forces may cause the re-stacking of sheets in MXene, which further reduces the specific surface area and restricts the transport of ions/electrolytes within the electrode, resulting in anticipated unfavorable electrochemical performance. In this experiment, heteropoly acids were used as dopants to oxidize pyridine for preparing the conductive polypyridine (PPY). By doping MXene with PPY, the resulting MXene/PPY composite exhibits significant advantages in averting the self-stacking of MXene nanosheets induced by van der Waals forces, promoting electron migration, and improving specific capacitances. Under the synergistic effect of highly conductive MXene and electrochemically active PPY, the symmetric supercapacitor fabricated with MXene/PPY attains an energy density of 8.77 Wh kg-1 at a power density of 750 W kg-1. More importantly, it maintains a capacity retention rate of 75% after 4000 cycles of continuous charging and discharging. The favorable energy density and power density, along with excellent electrochemical stability, suggest that the fabricated MXene/PPY composite has considerable potential for practical applications.