China has said it backs a full U.N. membership for Palestine as it called out Israel's brutal war on Gaza and demanded an immediate cease-fire.

"It is a tragedy for humankind and a disgrace for civilization that today, in the 21st century, this humanitarian disaster cannot be stopped," China's Foreign Minister Wang Yi told a press conference.

Beijing has been calling for an immediate cease-fire since the start of the current Israel-Hamas conflict last October.

China has historically been sympathetic to the Palestinian cause and supportive of a two-state solution to the Israeli-Palestinian conflict.

And President Xi Jinping has called for an "international peace conference" to resolve the fighting.

"No reason can justify the continuation of the conflict, and no excuse can justify being desperately killed," Wang said.

"The international community must act urgently, making an immediate cease-fire and the cessation of hostilities an overriding priority, and ensuring humanitarian relief an urgent moral responsibility."

Beijing's top diplomat also said China supports "full" United Nations membership for a Palestinian state.

"We support Palestine becoming a formal member of the United Nations," Wang said.

"The catastrophe in Gaza once again reminded the world that the fact that the Palestinian territories have been occupied for a long time can no longer be ignored," he said.

"The long-cherished wish of the Palestinian people to establish an independent country can no longer be evaded, and the historical injustice suffered by the Palestinian people cannot continue for generations without being corrected," he added.