Shane Warne has been bitten on the head by an Anaconda.

The former Australian Test cricketer was treated by an on-hand medic on the South African jungle set of I'm A Celebrity...Get Me Out Of Here! after he was bitten by the snake during the latest challenge on the Network Ten reality show.

Although non-venomous, Anacondas are aggressive and have a painful bite that is compared to getting 100 hypodermic needles at once.

Warne received some small marks, but will bear no permanent scarring.

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The juvenile Anaconda struck as he put his head in a box of different kinds of snakes as part of the show's Tucker Trial, which airs on Thursday night.

Using only his mouth in the race-against-time challenge, he had to secure stars, which represented meals for his hungry camp mates.

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First, he put his head in a box of rats, then a box of snakes hissing with Anacondas, Rat Snakes and Corn Snakes.

Host Dr Chris Brown warns Warne beforehand to be careful, as the snakes will be able to smell a rat on him and think he is food.

- AAP