The 68-year-old man was seriously injured after being hit by the tractor, while undertaking maintenance work on his farm, a WorkSafe spokeswoman said.

He suffered serious head injuries, but later died in hospital.

Worksafe said farmers are over-represented in workplace fatalities. 

WorkSafe executive director of health and safety Marnie Williams said the death was a timely warning for people who worked alone.

"When you are working by yourself, it's vital you make sure you follow appropriate safety procedures because there's no one to turn to if trouble strikes," she said.

Ms Williams said farmers continued to be over-represented in workplace fatalities.

"Agriculture employs just 3 per cent of Victorian workers but the industry makes up almost 30 per cent of all workplace fatalities every year," she said.

She said most fatalities were farmers working on their own.

"So if you are working alone, please take care. Safety must be your priority," Ms Williams said.

WorkSafe is investigating the death.