Abromeit was born in Tilsit, and in his youth he was a leather merchant.

From 1939 to 1941 he served as head of the SD-Special Section for the Evacuation of Poles and Jews that forced resettlement from Danzig and West Prussia.

From 1942 he was Jewish adviser to Croatia in the Jewish Section (IVB4) of the Reich Security Main Office (RSHA) under SS-Obersturmbannführer Adolf Eichmann.

In 1944 he was employed with Eichmann, Dieter Wisliceny, Theodor Dannecker, Hermann Krumey [de], Siegfried Seidl, and Franz Novak in Hungary, to oversee the deportation of Jews in the concentration camps at Auschwitz.

He escaped Germany as World War II in Europe came to an end and was believed to have gone to Egypt.