Willy Reetz was born and died in Düsseldorf, where he started his career as an apprentice with a church painter.
In his early years until World War II he performed mural painting which had a long tradition in Düsseldorf.
His mastery in this respect was reflected by the creation of several mural paintings in the Düsseldorf region: Together with Hans Kohlschein he created the frescos in the church Maria Rosenkranz in Düsseldorf-Wersten.
Over 40 years, Willy Reetz was a member of the artists organization "Malkasten" and saved its precious archives during the war.
After the war, Willy Reetz became a member of the artists group "Künstlergruppe 1949" and continued his activities in the "Malkasten" thus contributing to its reconstruction.