He was a close associate of the republic's founding father, Sun Yat-sen, an active member of the Kuomintang ("Chinese Nationalist Party"), and a judge on the Permanent Court of International Justice in the Hague.

He returned to China from London in the autumn of 1911, and when the anti-dynastic Xinhai Revolution of October 10 began, he became adviser to Chen Qimei, the revolutionary military governor of Shanghai.

He moved to Shanghai and assumed the roles of vice-chancellor of Fudan University and chief editor of the Zhonghua Book Company.

Though he stayed out of some major political events during the early anti-Yuan era, in May 1916 he became deputy commissioner for foreign affairs of the military council in Guangzhou, headed by Liang Qichao and Cai E. Wang served as chief justice of the Chinese supreme court in 1920 and justice minister of the Beiyang government of Li Yuanhong in June 1922.

It was amid continued political power struggles and warlord rivalries that Wang gladly accepted an appointment as deputy judge of the Permanent Court of International Justice in the Hage from 1923 to 1925.

In 1930, Wang was elected judge on the Permanent Court of International Justice, but he delayed his acceptance as he was guiding the process of drawing up the provisional constitution of 1931.

Wang Chonghui served as foreign minister from March 1937 - April 1941, a painful time during which Japanese invasion would kill millions of Chinese civilians and force the ROC government to relocate from Nanjing to a provisional capital in Chongqing.

[3] Upon his return to China, he served as director of the Far Eastern Branch Committee of the Commission for the Investigation of Pacific War Crimes.