After the war, Werner was initially employed at the Deutsches Theater Berlin.
In 1944, he was on the list ( The Gottbegnadeten-Liste "God-gifted list" or "Important Artist Exempt List") of those pardoned by the Reich Ministry for Popular Enlightenment and Propaganda.
From 1921, the character actor appeared in silent films and became a popular supporting actor with the advent of sound film.
He was not only a German film and theater actor, but also a radio play and dubbing actor.
Walter Werner had been working as a stage actor since 1900, initially in the provinces and finally in Berlin after the First World War, where he was a member of the ensemble of the Prussian State Theater from 1919 to 1944.