The invention discloses a moulding mould for a dual-density product, comprising a mould moving template, a mould fixing template, a mould moving rear panel, a mould fixing rear panel, a mould fixing cooling water pipe, a mould moving steaming chamber, a mould fixing steaming chamber, a mould moving spile assembly and a mould fixing spile assembly, wherein the mould moving spile assembly is mounted on the mould moving template in a plug-in manner and can be inserted into a cavity to divide the cavity into three parts which are used for infecting raw materials with different densities, the mould fixing spile assembly arranged corresponding to the mould moving spile assembly is mounted on the mould fixing template in a plug-in manner, and the mould fixing spile assembly can not only withdrawfrom the mould fixing template under action of the mould moving spile assembly but also reinsert into the mould fixing template to seal the cavity after withdrawal of the mould moving spile assembly from the cavity. The invention can mould two different raw materials into the dual-density product for one time, thereby shortening production cycle by 50%, improving capacity, saving production cost,increasing strength of products and ensuring quality stability.