A man has died after a 200-kilogram pallet loaded with computer equipment fell on him at a Melbourne warehouse.

Ambulance Victoria said the man, aged in his 50s, died at the scene in Laverton North just after 3:00pm (AEDT) yesterday.

"It appears the man was helping others unload a large computer server from the back of a truck," ambulance spokesman Mark Lamb said.

"The equipment has started to slip from a forklift and it appears the man has tried to stop it.

"It has then fallen on him and he has suffered critical head and chest injuries."

Workmates applied CPR before fires crews and paramedics arrived, but the man died a short time later.

- ABC/AAP