Kapitokhin was born in Kamenka-Loginovka village, Eletsky County, Oryol Governorate. He graduated from the fourth grade of rural school. He studied at the teacher's school for three years and graduated in 1909 with the rank of primary school teacher. In 1911 he graduated from another teachers' college and became a teacher of Russian language and literature in Borisoglebovskoe village, where he worked until conscription in 1914.
World War I
Kapitokhin was drafted into the Imperial Russian Army in October 1914. He became a private in the 147th Infantry Reserve Regiment, based in Kuznetsk. From May to October 1915, he was educated at the ChuguyevJunker School and graduated as a lieutenant. From June 1916, he was a company commander in Irkutsk, first with the 10th Siberian Reserve Rifle Regiment and then with the 11th Siberian Reserve Rifle Regiment. In September 1916, Kapitokhin was sent to the Western Front, where he fought with the 31st Siberian Rifle Regiment. In December 1917, he was demobilized.
Kapitokhin was an instructor in the Eletsky union of Consumer Societies. In December 1918 he joined the Red Army and was appointed the commander of a battalion of the 99th Rifle Regiment of the 11th Rifle Division. In March 1919 Kapitokhin was transferred to the same post in the 98th Rifle Regiment. As part of the 11th Rifle Division, Kapitokhin fought in the Estonian War of Independence and against forces commanded by Stanisław Bułak-Bałachowicz. In July he commanded the assault group of the Western Army. In October he was assistant commander and then commander of the 23rd Brigade of the 8th Rifle Division. Kapitokhin fought in the Polish–Soviet War and was captured in January 1920 in Bobruisk. He spent four months in prison, but escaped during the Soviet May offensive. Kapitokhin was awarded his first Order of the Red Banner during the same year. In October 1920 and February 1921 he commanded the 1st Separate Rifle Brigade on the Caucasian Front.
Interwar period
Kapitokhin served with the 6th Rifle Division in the Belorussian SSR, where he was the assistant commander of the 16th and 18th Rifle Regiments. In November 1923, he was sent to study at the Red Army infantry commander school. After graduation in September 1924, Kapitokhin was demobilized. He went to the Frunze Military Academy, from which he graduated in October 1931. He became a reservist and was the chief of the Office of Defence Mobilization of the Central Union of Consumer Societies. Kapitokhin was then the chief of the weather station on Uyedineniya Island. On 24 September 1939, he became the deputy head of the Chief Directorate of the Northern Sea Route. For his work in the Arctic, Kapitokhin was awarded the Order of the Badge of Honour and given the title "Honorary Polar Explorer". In 1940 he was promoted to Colonel.
Kapitokhin was appointed chief of the Tambov Suvorov Military School in November 1945. In July 1950, he was discharged due to illness. Kapitokhin died in Moscow on 13 August 1958 and is buried in the Vagankovo Cemetery.