Man dies at Melbourne construction site

A man has died at a construction site in Melbourne's CBD.

The man fell from a piece of equipment in South Wharf just before 3.35pm on Wednesday, police say.

CFMEU boss John Setka says the man was a boilermaker aged in his 50s.

Mr Setka tweeted that the man was fatally injured "while operating a boom-lift at the Melbourne Convention Centre construction site".

Structural steel installation at the site began in September.

The works are part of an expansion of the centre, that includes a new 331-room hotel and multi-deck parking facilities as well as extra exhibition space that will increase the building's total size to more than 70,000 square metres.

Worksafe has been notified and police will prepare a report for the coroner.