Staff from the Independent Commission Against Corruption raided the Sussex Street headquarters on Tuesday morning, sources have told AAP.

"The donations in question were received in 2015 and have been fully investigated by the NSW Electoral Commission with the full cooperation of NSW Labor, including the provision of all relevant documents," NSW Labor said in a statement.

Several Labor MPs have been linked to wealthy Chinese donors in recent years.

The raid was in relation to an annual Chinese Friends of Labor fundraising event held in 2015, according to News Corp Australia and the Sydney Morning Herald.

A party source told AAP the ICAC staff accessed computers at the NSW Labor offices.

The source argued the raid had been timed to coincide with the ALP national conference in Adelaide, which is attended by the organisation's heavyweights.

"It's clearly intentional," they said.

An ICAC spokeswoman said the commission would not be commenting on operational matters.

Federal Labor MP Matt Thistlewaite said he supports the work of ICAC.

"It's been a great body that's uncovered corruption, investigated corruption and ultimately led to the prosecution of a number of individuals and the jailing of a number of individuals in NSW," he told Sky News on Tuesday.

Former NSW Labor powerbrokers Eddie Obeid and Ian Macdonald are both in jail on corruption charges after initially being investigated by ICAC.

Mr Thistlewaite said he couldn't comment on the "ongoing investigation".

The Sydney-based MP wouldn't be drawn on on the timing of the raids saying he didn't want to "second guess" the corruption watchdog.

"They should be given all of the support to do the job that they're established to do," he said.

ALP national president Wayne Swan said he wasn't worried "at all" about the raid.

Australian Associated Press