The woman, identified as P Venkata Ramana, lived with her husband and children in a hut near zilla court centre here, police said.
Their hut caught fire from a candle that was lit last night. While her husband and children managed to come out, the woman was seriously burnt and died on the spot, Chilakalapudi Circle Inspector B Janardhana Rao said.
A case has been registered in this regard and investigation is underway, he said.