Maria (Julie Andrews) is a young and lively nun who likes to sing loudly in nature, so she often forgets the rules of the monastery. The dean believes that Maria does not belong to a monastery with strict rules. After discussing with the nuns, the dean decided to arrange for Maria to be a tutor in the home of a colonel named Trapp (Christopher Plummer). The colonel's wife has been dead for many years, leaving behind 7 children, and he requires strict discipline for the children. He told Maria that the tutors in his house could not last long because of the children's pranks. Maria was indeed pranked, but the kind teacher did not tell their father, but took care of the children like a mother, and soon became one with the children. The colonel gradually changed his attitude towards the children under Maria's guidance. The colonel and Maria fell in love. After they got married, they returned to Austria, which had been occupied by the Nazis. The colonel did not want to work for the Nazis, and the family prepared to escape...