China will welcome British Prime Minister Theresa May at an appropriate time, Foreign Ministry spokesperson Lu Kang said on Wednesday, providing no details about the timing of the visit.

May's spokeswoman was quoted by Reuters as saying May will make a visit this year, the latest of her trips to major trading powers as she negotiates Britain's divorce from the EU.

"We are willing to work with Britain to advance sustainable, healthy and stable development of the China-Britain global comprehensive strategic partnership for the 21st century," Lu said.

The spokesperson said China believes Britain and the EU will negotiate a "win-win" deal.

A prosperous, stable and open Britain and Europe is in the interests of all, Lu added.

This year marks the 45th anniversary of diplomatic relations between China and Britain.