Beating Ukrainian opponent Oleksandr Chernetskyy in the men's Greco-Roman final in the 130-kilogram category, Kayaalp won the European title for the fifth time in a row.
This is his sixth European title at the senior level; he was victorious in five European tournaments in 2010, 2012, 2013, 2014 and 2016.
He also triumphed at the European Games in 2015 in the Azerbaijani capital Baku.
Runners-up Chernetskyy won the silver medal.
Bronze medals in the category were given to Swedish Johan Magnus Euren and Belarussian Ioseb Chugoshvili.