The project will bring together innovators from the third sector with public sector commissioners and social investors such as grant-making foundations and the lottery.
"There is a lot of innovation in the third sector that remains local and small-scale and does not impact on the mainstream delivery of public services," said Matthew Horne, interim director of the exchange.
"The problem is that the commissioners of public services are often not experienced at commissioning from the third sector."
Two 'innovation networks' focusing on social themes will also be announced at the launch. They will include between 200 and 300 members and bring together third sector innovators who will offer their ideas to investors and the public sector.