Susanna knows what the count thinks, but Figaro knows nothing. Susanna reminded Figaro to be careful of the count, or he would make a joke.

Doctor Bartholo and female guardian Marce Lina came on stage together. She was holding an early IOU from Figaro, which said that if Figaro could not pay back the money, she would marry her. Figaro is getting married tonight, and she asked the doctor for help. Basolo was the guardian of the Countess Lin Xiawei, and Lin Xiawei was taken in by Figaro and married by Count Alma Viva. He also wants to take this opportunity to get back at Figaro (as you will see later, in fact, Figaro is the illegitimate child of Bassolo and Masirina in his early years. )

The count's little servant, Chebino, asked Susanna for help. The count saw him tryst with Babalina, the gardener's daughter, the night before and threatened to drive him away. He asked Susanna to plead with his wife. When the count came, rubino had to hide behind an armchair. The count thought Susanna was the only one in the room, so he made love to Susanna with confidence. He didn't expect Basilio to come, so the count had to hide. Basilio came into the room and told Suzanne that the relationship between Chebino, a servant, and his wife was abnormal. Hearing this, the count immediately came out and asked him to explain what was going on. Three people sang a trio. The count remembered that he had caught Cupino last night, so he grabbed the clothes from the armchair and sang, "Easy, that guy …" But he found the little angel hiding there, which aroused the count's suspicion and anger.

Figaro came in with several farmers and flowers to pay tribute to the count, thanking him for canceling the first night right enjoyed by his servants when they got married. In front of everyone, the count had to approve. Susanna and Figaro pleaded with the count for Chedjou Pino, and the count asked him to go to the barracks to be a soldier and set off at once. Figaro encouraged Chedjou Pino to sing the famous aria "Don't Be a Lover" and walk out of the room with Chedjou Pino.