Four New Year's Eve revellers ended their night in hospital after sustaining injuries from fireworks, including one man who burnt his own hand after lighting 20 sparklers.

Police were called to six firework incidents across the state in the early hours of Wednesday, including one which sparked a grass fire at Galvin Park Reserve in Werribee that burnt about half a hectare, despite repeated warnings from authorities about the dangers of illegal fireworks.

No one has been arrested over the incidents and all of those injured were taken to hospital in a stable condition.

A 25-year-old man was with a group of 20 revellers at a Healesville soccer oval, when a firework struck him in the chest and face at about 12.20am on Wednesday. He was taken to Maroondah Hospital.