Five people were reported dead and 99 injured in Hainan Province since its first landfall at Wenchang City yesterday.
Two people in Beihai, Guangxi Zhuang Autonomous Region, were confirmed dead and three people in a critical condition have been taken to a local hospital, state-run Xinhua news agency reported.
The state-run television showed wide spread destruction in several cities and villages in the area.
Typhoon Rammasun, believed to be the strongest to hit south China in 41 years, made its third landfall in Guangpo, Fangchenggang City, Guangxi, at around 7.10 am.
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Gales and strong downpours have struck a number of coastal cities in Guangxi since this morning.
In Beihai, fallen trees and powerlines have blocked major roads and damaged buildings with some roofs blown away.
Dai Yanhui, a Beihai resident, said that he felt his house shaking in the ferocious winds.
"It is the biggest typhoon I have experienced in years," Dai said.
The typhoon also paralysed the power network in the city. In Fangchenggang, roads are strewn with garbage and trees. Gas stations are temporarily closed.
High-speed train services between Nanning and coastal cities have been suspended. In Guangdong, more than 14,800 people have been relocated.
The typhoon had wreaked havoc earlier in the week in Philippines.