The invention discloses a molded paper roll die which comprises an upper die and a lower die, wherein the lower die consists of a hot pressing die frame, a de-molding plate, an expansion member, a die core, a spring, a die set and a de-molding pushing element. Molded paper rolls are manufactured by the molded paper roll die through mixing bagasse, cornstalk, corner-wasted head-tail bamboo timber and the like with resin and then carrying out high-temperature and high-pressure curing, therefore, the destroy to the forest resources is reduced and benefit is brought to the environment protection.