The story of Pan Dongzi, a teenager and son of a Communist army officer. When the father is called off, he leaves Dongzi a red star as a symbol of the cause. While he is away, a bourgeois landlord, Hu Hansan, returns to Dongzi's village where he exacts revenge upon the peasants who had forced him out

故事发生在红军抗击日寇时期。少年潘东子（祝新运 饰）的父亲响应号召，参加红军抗击敌军去了，只剩下母亲与东子相依为命。母亲也是抗敌的积极分子，从小耳濡目染的东子虽然只有11岁，也立下了决心长大参加红军对抗日军。一天，汉奸胡汗三带领日军来捉拿东子的母亲，眼看形势危急，东子妈决定留下来掩护其他群众撤退。在连扔两枚手榴弹砸死多名敌人后，东子妈亦英勇就义。目睹了妈妈被敌人杀害的惨况，东子决心用自己的力量为母亲报仇。东子开始用自己的机智与勇敢与敌人周旋，暗中帮当地的游击队送盐送信。通与敌人的斗争，东子渐渐成长，替母亲报仇的时刻也终于来到。