Maa Madurai movie tells about the love between a rich girl and a poor boy but the film has also mother sentiment in it. Nandhini (Mithuna) is the sister of a politician Kottai Kumar (played by the producer). At one instance Nandhini who travels by train to Madurai leaves her mobile phone in the train.
Saravanan sees the phone and tries to give it back to Nandhini. For this he goes to Nandhini's house to return the phone to her. Seeing a coolie coming in search of his sister Kottai Kumar becomes angry like any other villain and warns his sister. In spite of that Nandhini and Saravanan become good friends and in the due course Nandhini falls in love with the hero. Saravanan is in search of his lost mother. Saravanan some how finds his mother. In the meantime, the villain does everything to separate his sister from Saravanan. But he realizes his mistake. Later they both will unite.