Shrinkage die with upper loose core

The invention discloses a shrinkage die with an upper loose core. The shrinkage die comprises a fixed die and a moving die which can be combined with the fixed die, wherein the fixed die is inlaid with a plurality of fixed die inserts which can be mutually spliced, and the moving die is inlaid with a plurality of moving die inserts which can be mutually spliced; and the upper end of the moving die is provided with an upper slide block, the upper slide block is provided with a plurality of upper slide block cores which can be mutually spliced, and the upper slide block and the upper slide block cores form a shrinkage upper loose core. In the invention, the shrinkage die with the upper loose core can carry out adaptive combined change on the upper slide block cores of the upper loose core when the positions of the fixed die inserts and the moving die inserts change, i.e. the combined length of the inserts changes, thus obtaining the products which are in an upper loose core shape and have different length speci