In 1926 he studied engravings in the class of Alois Kolb at the Academy of Graphic Arts in Leipzig (Akademie für graphische Künste Leipzig).
In 1923 he founded, together with the painter Karl West. Schmidt a commercial art studio in Zittau, Germany. One year later he served as a newspaper cartoonist in the Ostsachsendienst. Exhibitions followed in 1936 with purchases of graphical cabinets Bautzen, Dresden, Leipzig, Görlitz and the National Museum in Stockholm.
The Nazi government engrossed his artistic work in 1940 with a graphics exhibition in Leipzig with Arthur Kampf and Karl Truppe.
Due to his refusal to join the NSDAP he lost his position at the City Museum Bautzen and was drafted for military service. After being held as a prisoner of war by the American army 1945 in camp in Heilbronn, he became a resident of Dinkelsbuehl.
1946 was followed by portraits of prominent personalities: Apostolic Nuncio Aloysius Muench, Marshal of the Military International Trib. Nuremberg, Robert H. Jackson, Matthias Wiemann, Marianne Hoppe, Hermann Claudius, Ludwig Tügel, Victor Gostomski of others
He settled in 1969 in Ravenstein Merchingen.
1975-1977 was followed by several exhibitions in Munich and Crailsheim and a special exhibition in Rothenburg ob der Tauber.
In 1980 the work book " With Geißfuß and prick through an artist"s life - 100 woodcuts from 6 decades. ", Published by the Galerie Ravenstein 1981–1982 undertook Warnecke study tours to Greece, Italy and California, followed by a joint exhibition in Paso Robles, California at the home of Ray A. Pielop, Certified Public Accountants (United States of America), Berlin and Munich, together with Frans Masereel, A. Paul Weber and Josef Hegenbarth. following year he created the 36m high wall painting " Peasants" War " in an idol"s castle Ravenstein. 1985 anniversary exhibitions took place in Munich, Bautzen, Dinkelsbühl Mölln and Kronach.
In the same year he was made an honorary citizen of the city Ravenstein.
In 1989 he created a portrait of the space pioneer Hermann Oberth. A few years before his death, Warnecke used artistically again his native city Bautzen and created with "old Bautzen " 20 largescale oil painting " Budissin"sches mosaic " with 50 illustrations on the history of Bautzen, their myths and Originals (Lusatia -Verlag, Bautzen), and a new edition of 20 woodcuts of the medieval city of Bautzen appeared (published by the Galerie Ravenstein) on the occasion of the celebrations of the millennial city.
Rudolf Warnecke died in 1994 at the age of 89 years in Merchingen.