The youth, identified as Vignesh, was a member of the Naam Tamizhar Katchi (NTK) party founded by film director S. Seeman.
The NTK party statement said Vignesh died on Friday and his body will be kept at the party office here for people to pay their last respects.
The body will be transported to Vignesh's native place -- Mannargudi town -- and the final rites will be held there on Saturday.
The self-immolation bid happened on Thursday when the party was holding a rally here in support of Tamil Nadu's claims over Cauvery river water.
Suddenly Vignesh poured kerosene on himself and lit the match. Though the blaze was doused quickly, he suffered severe burn injuries and was taken to a government hospital for treatment.
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