The precision plastic mold mainly includes a combination of a concave mold base plate, a concave mold component and a concave mold.

     The concave mold with a variable cavity composed of a card board is a convex mold with a variable core composed of a convex die combined substrate, a convex die assembly, a convex die combined card board, a cavity cutting component and a side cutting combined board. Coordinated change of mold convex, concave mold and auxiliary forming system. It can process plastic parts of different shapes and sizes.