Berdimuhamedov was largely expected to secure his post when voting in the Central Asian republic got underway on Sunday.
Eight contenders competed against the Turkmen president-elect in the latest election, whose turnout stood at 97.27 percent of the population, according to Sputnik.
Last year, Turkmenistan amended its constitution in a way that could allow Berdymuhamedov to stay in power indefinitely, removing the 70-year age limit for presidential candidates and extending the presidential term to seven years from five.