The invention relates to a composite die master die as well as a manufacturing method and application thereof. The method comprises the following steps of manufacturing a steel frame, and stacking steel strips on the steel frame to form a steel profile; laying a wood slab layer on the steel profile to form a wood slab layer profile; adhering a foam layer to the wood slab layer profile, and performing rough machining to form a roughly machined profile; laying a glass fiber reinforced plastic layer on the foam profile to form a glass fiber reinforced plastic layer profile; and laying a wood substituted resin layer on the glass fiber reinforced plastic layer profile, and performing finish machining to obtain the master die with a finish machined profile. The invention also provides the masterdie manufactured by the method and application of the master die in manufacturing a composite die. The method has the advantages of low cost, small processing difficulty, short production period andthe like; and the manufactured master die and the manufactured composite die have the advantages of good temperature resistance, high die accuracy, light weight and the like, overcome the problems ofsurface cracks, deformation and the like of a traditional composite die and have large potential market in the field of aircraft and vehicle manufacturing and the like.