The explosion is believed to have been caused when a leaking gas cylinder inside the van was accidentally ignited after the owner parked up for the night.
A spokesman for Doncaster police said the man had been asleep in the van and he woke after it had got dark.
It is thought he flicked a lighter so he could see what he was doing and the spark caused the cooking gas canister in the van to explode.
Perhaps he just left the cooker on unlit.