The utility model discloses a rubber aerated core mold, which belongs to the technology field of rubber cloth products. The utility model is characterized in that: the utility model comprises a cylindrical inflator pump and uniform head end covers bonded with bandings on both ends; wherein, one end cover is fixed with an inflation valve and the internal wall surfaces of the end covers are in arc shape. The utility model solves the problems of short working time and low firmness caused by large gap between poured beams existing in presently used rubber aerated core mold with cone type ends on both ends. The utility model can be not only used for the pouring of the bridge body but also widely used for the production of other precise reinforced concrete members.