The world's top economies are set to declare on Saturday that they need to look beyond ultra-low interest rates and printing money if the global economy is to shake off its torpor, while promising a new focus on structural reform to spark activity.

A draft of the communique to be issued by the Group of 20 (G-20) finance ministers and central bankers at the end of a two-day meeting in Shanghai reflected myriad concerns and policy frictions that have been exacerbated by economic uncertainty and market turbulence in recent months.

"The global recovery continues, but it remains uneven and falls short of our ambition for strong, sustainable and balanced growth," the leaders said in a draft seen by Reuters.

"Monetary policies will continue to support economic activity and ensure price stability ... but monetary policy alone cannot lead to balanced growth."

Geopolitics figured prominently, with the draft noting risks and vulnerabilities had risen against a backdrop that includes the shock of a potential British exit from the European Union, which will be decided in a June 23 referendum, rising numbers of refugees and migrants, and downgraded global growth prospects.

But there was no sign of coordinated stimulus spending to spark activity, as some investors had been hoping after the market turmoil that began 2016.