A man is fighting for life after he was mowed down by his own vehicle while it was being stolen.

The incident happened at a petrol station on the Great Northern Hwy in Halls Creek, in the east Kimberley region of WA, about 10.45am on Saturday.

A 76-year-old man had parked his Isuzu D-Max ute towing a white caravan at the service station.

Police say he was inspecting the van when someone jumped into the ute and drove off, hitting the man in the process.

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The victim suffered life-threatening injuries and was airlifted to the Royal Darwin Hospital.

Anyone who witnessed the incident or has any relevant CCTV/dashcam footage has been urged to come forward.