牛小波（包贝尔 饰）出生在一个棺材世家，几代人以做棺材为生。因小时候一次离奇的事故，小波永远失去了“笑容”，无论碰上多么开心的事他都笑不出来，被人们称之为怪人，好在前些年一直生活在农村老家，他本人也没觉的不会笑是什么大不了的离奇事。渐渐长大成人的小波决定走出大山，到外面闯世界，可外面的世界虽精彩，闯起来却很无奈，原本想离开老家的棺材铺谋一份体面的工作，可最终还是进了殡仪馆工作，这令他多少有些失落。随着时间的推移，小波在殡仪馆领略了世间另一面的人生百态，目睹了各种各样家庭在亲人化为一缕青烟时所表现出的真实状态，明白了他先前没有悟到的人生百味..

Wavelet cow born in a coffin family, a child of an absurd accident, he never lost, "smile", but fortunately been living in rural areas, simple environment does not make him feel "laugh" is a serious matter what. Growing up efforts of the mountains, leaving raised his coffin shop, go to the outside world battles, but still had to work into the funeral home. Wavelet witnessed at the funeral home vicissitudes of life, from the perspective of a funeral home handyman departure of family, friendship, love, new understanding on "Life last stop" platform for wavelet slowly growing. Wavelet cow eventually learned to "laugh", but in the last one to leave his loved uncle Hydride day.