SYDNEY, Australia — Australia has canceled the residency of a wealthy political donor tied to the Chinese government, officials confirmed Wednesday, denying his citizenship application and stranding him overseas in a widening conflict with Beijing over its efforts to influence Australian politics.

The donor, Huang Xiangmo, is a successful developer who has lived in Sydney since 2011 and who has donated millions of dollars across the Australian political spectrum in recent years. He has done so while leading organizations tied to the United Front Work Department, an arm of the Chinese Communist Party that promotes Chinese foreign policy abroad and works with various groups inside China.

Mr. Huang’s office did not respond to requests for comment, and his whereabouts were unknown.

He has previously rejected claims that his political donations were linked to Beijing. But experts said that keeping him out of Australia reflected deepening global skepticism about China — and a tougher stance toward its alleged proxies.

“It’s a very punitive measure,” said Euan Graham, executive director of La Trobe Asia, a regional research and engagement arm of La Trobe University in Melbourne. “It’s a signal of the pushback against foreign interference — the government remains committed to that despite whatever softer line there may have been in the official diplomatic relationship.”