善良老妇李桂花因一念之仁,救下即将产仔的金壳河蚌。金壳知恩图报,不仅赐珠救活其老伴,更在其孤(gū )苦无(wú )依时(shí ),派儿(ér )子江(jiāng )生化(huà )作凡(fán )人陪(péi )伴左(zuǒ )右,为她养老送终。祖孙俩以善行感化乡邻,齐心击退了贪图河神财富的恶霸。最终江生功成重返大江,一生向善(shàn )的李(lǐ )桂花(huā )在村(cūn )民敬(jìng )重中(zhōng )安享(xiǎng )晚年(nián ),高寿(shòu )善终(zhōng )。