The invention belongs to the technical field of polymer preparation, and discloses a plyamide solid phase viscosity increasing control ball and application. The control ball is formed by blades; one ends of the blades are connected together; the other ends of the blades are scattered in a ball shape in a three-dimensional space; each blade sequentially consists of a surface layer with a mesh structure, an inner layer filtering screen layer and an inner space from outside to inside; inorganic particles are filled in the inner space; the inner layer filtering screen layer can realize the gas passing and simultaneously prevents the inorganic particle seepage. The control ball provided by the invention has the advantages that the blades can provide separation layers for solid polyamide or copolyamide slices; in addition, the slice turning energy can be promoted in the dynamic state; the polyamide or copolyamide slices in the ball are controlled to move along the blade, so that the turning of the slices is enhanced; meanwhile, the adsorption can be performed through the inorganic particles in the blades; the overflowing of water vapor in the polyamide or copolyamide slices can be facilitated; the enhanced stirring effect is achieved; then, acid gas is slowly released, so that the proceeding of the solid phase viscosity increasing process is promoted.