在这部乾坤三决斗动作/武侠/古装片中,晋朝，江南义兴地方出了三害，乾坤三决斗一害是南山上的猛虎，经常出没山林之间，为害樵夫，使南山一带居民，纷纷他迁；另一害是长桥下的孽蛟，时时在河里兴风作浪，危害渔民舟楫；第三害是恶霸周处，在义兴街上时常滋事，鱼肉善民。周处闻之，慨然有改励之志，乃射虎斩蛟，痛改前非，励志好学，投军报国，数年後，名声大振........
A rural magistracy encounters three scourges that threaten destruction to the entire village: a fierce tiger, a demonic dragon and a criminal convict fugitive who turns out to be the only hope for salvation to defeat the other two evils.
