In the process of oilfield development and production，scale inhibitors are widely used to mitigate scaling in reservoirs，wellbores，and transportation pipelines. However，the interaction mechanism between scale inhibitors and scaling ions such as Ca²⁺ and Mg²⁺ in high-salinity fluids remains unclear，and the coupling effects among field-applied scale inhibitors，biocides and corrosion inhibitors have not been systematically investigated，which hinders the efficient and scientific application of chemical agents. In this study，a dynamic testing platform based on laser turbidity was innovatively established，which enabled rapid batch testing of scale inhibitor performance under simulated reservoir conditions including oxygen-free environment，high temperature and flowing state. The effects of Mg²⁺，Fe²⁺ and Sr²⁺ on the scaling of CaCO₃ and BaSO₄ were investigated respectively，and the interaction between commonly used oilfield additives and scale inhibitors was analyzed. The results showed that the presence of Mg²⁺，Fe²⁺ and Sr²⁺ could prolong the induction time of CaCO₃ and BaSO₄ scaling respectively，and improve the scale inhibition efficiency. The introduction of multiple ions promoted the formation of Ba_xSr_1-xSO₄，Ca_xMg_1-xCO₃ and Ca_xFe_1-xCO₃ solid solution mixed scales，reduced the surface energy of scale crystals，and slowed down the scaling rate. Scale inhibitors exhibited synergistic effect with oilfield demulsifiers and corrosion inhibitors，while showing antagonistic effects with biocides. These findings provide guidance for the precise screening of high-efficiency synergistic chemical systems and the cost reduction and efficiency improvement of chemical anti-scaling technologies.