He helped found the National Socialist Teachers League in 1929 and joined the Nazi Party in 1930.
However, in August 1940 he was recalled to Berlin where he was appointed Stabsführer of the Hitler Youth and deputy to Reichsjugendführer Baldur von Schirach.
In October 1940 he was appointed by von Schirach to oversee the day-to-day operation of Kinderlandverschickung ("relocation of children to the countryside") from major cities at risk of aerial bombing.
In November 1942, Möckel became a member of the Reichstag, nominally representing Breslau (now Wroclaw in Poland).
Möckel was killed in a car accident in Darmstadt on 15 February 1945 whilst recruiting Hitler Youth volunteers for Operation Werwolf.