Based on the K2O-B2O3 -SiO2 ternary system glass, different glass composition parameters K values of Ag-doped alkali borosilicate glass were designed based on a fixed glass composition parameter R values. The base glass was prepared by melting method, and a one-step heat treatment within the crystallization temperature range resulted in the precipitation of spherical AgCl crystallites in all samples. The study indicates that the different glass composition parameters K values have a significant impact on the precipitation of AgCl crystallites within the Ag-doped alkali borosilicate glass. For the designed weak phase separation system glass, the variation of the glass composition parameter K values can affect the network polymerization of the glass, but the phase separation of the glass is not the main factor affecting the glass crystallization. Through glass structure analysis, the change in the glass composition parameter K values can affect the existence state of ZrO2 in the glass network, thereby reducing the solubility of ZrO2 in the glass network, increasing the nucleation sites in the base glass, and thus exerting a significant influence on the AgCl crystallization behavior in the Ag-doped alkali borosilicate glasses.