Zhou Mingying, a worker at a power plant in Northeast China, united her fellow workers under the leadership of the Party, overcame all difficulties, demonstrated a high degree of creativity, exposed the enemy's plots and sabotage, and quickly repaired the generators that had been damaged by the Kuomintang, ensuring the supply of electricity.

1931年9.18事变以后，赵一曼（石联星 饰）受党委派任哈尔滨总工会书记，和老曹（张平 饰）一起领导电车厂工人反日罢工运动。不久老曹被捕后牺牲。1934年赵任中共珠河县委委员兼铁北区委书记，组织义勇军，对日寇开展游击战争。秋天，她领导的农民自卫队与王团长（王炎 饰）所率抗日部队会师。红军长征到达陕北的消息传来，部队举行庆祝联欢，不料营地被鬼子包围，赵一曼率队突围，无奈敌人越上越多，她令王团长带主力先撤，自己带部分战士掩护，终因寡不敌众，不幸被俘。抓到赵一曼，敌认为钓到了大鱼，先是严刑拷打，后又威逼利诱，赵一曼尽显共产党人英雄本色，至死都没有开囗...... 本片获1950年第五届捷克卡罗维发利国际电影节最佳女演员奖。