Jaksch was born in Langstrobnitz, Bohemia, Austria-Hungary and started to work as a construction worker in the age of 14 in Vienna. He joined the Austrian Social Democratic Party in 1913 and served in the Austrian Army in World War I, where he was badly wounded. After World War I he started to work as a journalist for a German language Social-Democratic newspaper in Czechoslovakia. In 1929 he was elected as a member of the Parliament of Czechoslovakia in Prague representing the German Social Democratic Workers Party in the Czechoslovak Republic, of which he became the chairman in 1938. Jaksch opposed the growing influence of Nazis in Sudeten German Politics. After Germany invaded Czechoslovakia in March 1939 Wenzel escaped to Poland, and after the German invasion of Poland to Great Britain, where he represented the interests of the Sudeten Germans in the Czechoslovak government-in-exile. During the war Jaksch's relations with the Czechs became strained as he opposed to acknowledge the pre-Munich borders of Czechoslovakia of his homeland. After World War II the Germans were expelled from Czechoslovakia. Influenced by Edvard Beneš, the British Government refused to allow Jaksch's return to Western Germany until 1949. In 1949 he became responsible for Refugee affairs in the Social-Democratic Party of Germany, in 1950-53 he became director of the HessianState Office for Expellees, Refugees and Evacuees, and in 1951 he founded the Seliger-Gemeinde, an Association of Sudeten German Social Democrats. In April 1960 Jaksch regretted that West German politicians officially claimed only the 1937 borders of former Nazi Germany and declared that "No Sudeten German would go back to his homeland if he felt that he would to belong to a minority", demanding annexation and union of "German speaking territories" with Germany as a "sensible solution". In 1957 he was elected a member of the Bundestag, in 1961 he became the Vice-President of the Sudeten German Federal Assembly and in 1964 he became the President of the German Federation of Expellees. Jaksch was the President of the German Foundation for European Peace Questions and a member of the Sudeten German Council. Jaksch died in a road accident in Wiesbaden.
Was kommt nach Hitler?, in: Jitka Vondrová, Češi a sudetoněmecká otázka, 1939
Can industrial peoples be transferred? - The future of the Sudeten population, Executive of the Sudeten Social Democratic Party, London 1943
Mass transfer of minorities, Aufsatz in: Socialist commentary, London, ca. 1944
Sudeten labour and the Sudeten problem - a report to international labour, Herausg.: Executive of the Sudeten German Social Democracy Party, London 1945. - 47 S.
Wir heischen Gehör - ein wichtiges historisches Dokument für die Wiedergutmachung der völkerrechtswidrigen Ausweisungen; Petition an die Vereinten Nationen / von Wenzel Jaksch. München, Verl. "Das Volk", 1948.
Sozialdemokratie und Sudetenproblem, Frankfurt a. M./Höchst, 1949
Der Dolchstoß gegen den Frieden - Untertitel: Richters neue Legende, SPD-Faltblatt, Bonn, ca. 1950
Heimatrecht. Anspruch und Wirklichkeit, Verlag der Altherrenschaft bündischer Studentenverbände, Erlangen 1957.
Europas Weg nach Potsdam, 1958; 4. Auflage, München 1990,.
Der 4. März 1919 und das Elend der deutschen Geschichtsschreibung, Verlag des Münchner Buchgewerbehauses, München 1959.
Deutsche Ostpolitik - ein Experiment in Sachlichkeit; in: Die Neue Gesellschaft, Nr. 12/1965, S. 800 - 802.
Gedanken zur Ostpolitik, Verlag „Die Brücke“, Hg.: Seliger-Gemeinde, 32 Seiten, ca. 1966
