讲述小丸子性格乐观，自幼跟随父亲在街头卖艺维持生活，掌握一门胸口碎大石的绝活行走于江湖之中。小丸子在如意楼一场奇迹的相遇让不识字的小丸子意外成为知书达理的郡主，并且嫁进梅府，与梅三少爷拜堂成亲，改变自己人生的命运。此外九王爷的女儿陆英瑶奉旨成婚，没想到被土匪小宝爷当成压寨夫人，背回寨中。还有梅三少爷对婚事抗拒，摆出一副拒人千里之外的姿态，想要郡主主动退婚。而假扮郡主的小丸子对高冷的梅三少爷也非常的嫌弃，与对方斗智斗勇过程当中，成为一对欢喜冤家，逐渐产生情愫。最终小丸子的真实身份穿帮，但是也没有影响自己与梅三少爷的感情，又集合众人的力量，消灭盐帮的余孽，让所有的有情人终成眷属，花好月圆，结成真正夫妻

It tells the story of Chibi Maruko, who has an optimistic personality. She followed her father to perform on the streets to make a living since she was a child, and mastered the unique skill of crushing boulders on her chest to walk in the rivers and lakes. A miraculous encounter between Xiaowanzi in the Ruyi Building made the illiterate Xiaowanzi unexpectedly become a well-educated princess, and she married into the Mei Mansion, and married the third young master Mei, changing her life's destiny. In addition, Lu Yingyao, the daughter of the Ninth Prince, got married according to the decree, but she was taken back to the village by the bandit Xiaobao as his wife. There is also the third young master Mei who resists the marriage, putting on a posture of rejecting others thousands of miles away, and wants the princess to take the initiative to withdraw the engagement. And Xiao Maruko, who pretends to be the princess, also dislikes the aloof third young master Mei. In the process of fighting wits and courage with the other party, they become a pair of happy friends and gradually develop feelings for each other. In the end, Xiao Maruko's true identity was revealed to the gang, but it did not affect his relationship with the third young master Mei. He also gathered the power of everyone to eliminate the remnants of the salt gang, so that all lovers could finally get married, spend a full moon, and form a real couple