The film tells the story of Thenpandiko, the king of Inbapuri. Ellaipuram is a part of the kingdom and the king appoints his brother, Mukhari, to rule it. Mukhari has a minister, Imaya, who has evil designs. Mukhari falls prey to his evil plans, and besides taking over Ellaipuram, he plans to usurp Inbapuri from his brother. To help the suffering people enter a man named Kadhiravan, hailing from the royal family. He moves around the kingdom in the guise of a vagabond. Princess Kumari wishes to marry him, while he falls in love with Ponni, who is from the fisherfolk community. Coming to know of this, Kadhiravan's brother is furious. The princess is equally upset, but Kadhiravan is more interested in saving the people. Soon there is a protest led by him that gains momentum. What happens to it is narrated in the latter half of the film.
S. S. Rajendran was initially to play the lead role in Kuravanji. However, due to some "friction" between him and M. Karunanidhi, the role was later offered to Sivaji Ganesan. He was hesitant to accept as he believed Rajendran would misunderstand him if he accepted, but after being reassured by Karunanidhi, Ganesan accepted the offer out of respect.[4]Kuravanji is Ganesan's 60th film as an actor.[5] During the shoot, Ganesan chose to wear a gunny sack instead of the woollen clothes that were given to him. He wanted to "connect with the reality of the character of a tribesman".[6]Rajasulochana had been offered to act in the film but declined.[7]
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