Post-revolution
Magsarjav continued to fight remnants of Ungern's troops and other White Russian forces in Western Mongolia until mid-1922, He was then appointed Minister of the Western Frontier, and in December 1922, he became Minister of the Army. He was one of the first to refuse his feudal rank. In 1923 anti-revolutionary resistance groups (made up mostly of troops formally under Ungern command), sought Magsarjav's assistance. Magsarjav instead organized their seizure by the Ministry of Inner Affairs. In 1924, Magsarjav officially joined the Mongolian People's Party, and his title was transformed to Ardyn ("People's") Khatanbaatar Magsarjav. Later that year, he was sent to Moscow on official business. In 1925, he became a candidate member of the People's Party's central committee.
In 1926, Magsarjav became seriously ill and died on September 3, 1927. He is buried in a ger-shaped mausoleum in Bulgan town.
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