山鸡娶五代目草刈一雄的女儿草刈菜菜子为妻，藉以促成帮会与日本山田组的联盟。而蒋天养率领浩南等人，赴日参加婚礼，并结识了三联帮已故帮主之子雷复轰。雷复轰无意继承父业，却将帮主之位交予山鸡。可惜，受到代帮主忠勇伯大力反对，于是两人互生心病。刚巧雷复轰遇袭受伤，山鸡被怀疑是幕后主谋。之后山鸡遇袭重伤，菜菜子被奸等连串事件发生。草刈一雄当知道女儿被奸及山鸡遇袭后，即到台湾查明究境。于是，他便与浩南一起联手协助山鸡，查出事实的真相; 评论：总的来说，古惑仔拍到第六部，应该就是该系列的最后一部了，由于时代的变迁，观众品位的变化，黑帮片已经拍不出新意，而票房大卖的古惑仔系列再拍一集，完全是出于商业的考虑。本片演员阵容强大，前一集中失踪的山鸡（陈小春）重回古惑仔行列，令本片增色不少，第五集中只靠郑伊健一人独撑场面，感觉不如两人配合来的赏心悦目，第六集终于凑齐了原班人马。许多前几集中已经死去的角色，换了另外的角色重生，如小结巴变成了端木若鱼，大天二却成了奸角，成为了雷少爷的同学兼狗头军师，巢皮再次出现，而张耀扬不愧为古惑仔系列的第一反角，本次依然出现，坏得厉害; 第六集的剧情比较敏感，内容完全是模仿台湾政治选举，应该是比较大胆的作品，以前涉及到台湾政治的还有刘德华、梁家辉的《黑金》，但是由于本片的人物太多，剧本的线索也过多，不少场面虽然创意不错，但流于表面，未能深化，不过就本片的定位于商业片，有如此表现也不奇怪。陈浩南在洪兴最做越大，应该是最开心的，本片中，老大居然将整个黑帮都托付给了陈浩南，看来编剧也预示了这将是最后一集的古惑仔了，总的说，本片可以一看，绝对是收官之作
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