The 24-year-old, partnering Marko Huebenbecker having piloted Kevin Kuske last time out, topped the timesheets in both runs in Switzerland to claim his first-ever two-man World Cup victory.
The German pair clocked 1:07.59minutes and 1:06.92 for an overall winning time of 2:14.51 with home duo Beat Hefti and Thomas Lamparter second 0.16seconds behind for silver.
Manuel Machata and Andreas Bredau, the German No.2 crew, completed the podium in third with an overall time of 2:14.94 with American’s Steven Holcomb and Steven Langton fourth 0.10 behind.
Arndt’s win comes during an impressive year so far that has seen him win team gold in the opening World Cup leg in Igls and the European four-man title at round four in Altenberg.
He won junior world two-man gold in 2010 and the four-man title last year and his win keeps up the pressure on Hefti at the top of the overall World Cup rankings.