International Development Secretary Justine Greening said: “The scale of the problem requires the entire international community to do more to assist the affected countries which is why the UK is working with the government of Sierra Leone to build a new medical treatment facility near their capital Freetown.
“When it is up and running it will enable the UK to provide medical care for local and international health workers, as well as treatment for the wider population.”
The UK government has committed £25m to tackling the outbreak, including running trials for an Ebola vaccine.
The charity Save the Children will eventually take over management of the treatment centre.
Its chief executive, Justin Forsyth, said: “Ebola threatens thousands of people’s lives across West Africa and could set back development many decades.
“The key to combating this epidemic is backing front line health workers and underpinning a fractured health system in Sierra Leone.
“Without urgent action to assist medics, many more children and their families will suffer and die from this most appalling and tragic disease.”