Abstract: A cooling tower louver, including an adjustment module and a fixing module, is provided. Particularly, the adjustment module includes length adjustment assemblies, an angle adjustment assembly, and coupling assemblies, in which the angle adjustment assembly is positioned above the length adjustment assemblies, the coupling assemblies are positioned on a side of the angle adjustment assembly. Furthermore, the fixing module includes slat assemblies and a framework, in which the slat assemblies are located in the framework. Through the collaborative efforts of the adjustment module and the fixing module, it's possible to maintain the cooling tower's air intake capacity while minimizing the ingress of rainwater during wet conditions. The cooling tower system effectively mitigates the risk of equipment damage due to freezing during the winter season. Moreover, the anti-freezing method for the cooling tower streamlines the anti-freezing strategy and offers enhanced convenience in terms of regulation and control.