In‐situ doped polyaniline nanotubes were fabricated and investigated in term of their morphological, thermal and electrical properties at varied doping levels. Different from the common post‐doping of polyaniline base to form its emeraldine salt, the aniline monomers were directly converted into conductive emeraldine salt during synthesis by dropwise addition of the dopant and oxidants. This process resulted in a uniform and stable protonation of the polyaniline with good electrical conductivity. Furthermore, it was found that the crystalline conductive polyaniline nanotubes have a good flexibility when amalgamated with polyvinyl alcohol, showing their potential as flexible conductive coating materials.