nanorods) show strong polarized absorption and emission due to the dielectric confinement effect and intrinsic optical anisotropy of their asymmetric shapes. [5][6][7] CsPbBr 3 QD is a cubic crystalline phase with high symmetry at room temperature, resulting in almost no optical anisotropy in the single particle and colloidal solution. [8,9] However, many strategies, such as polymer stretching, electrospinning, nanoimprinting, and photolithography, have been utilized to align semiconductor QDs to generate and improve polarized absorption and emission of semiconductor QDs by implementing orientation arrangement. [10][11][12][13][14][15][16][17] By rotating coating CsPbBr 3 QDs on a silica substrate, the silica substrate induced charge redistribution in CsPbBr 3 QDs, resulting in anisotropic dipole transition distribution and overcoming the population averaging effect to produce polarized emission. [18] Furthermore, It is reported that patterned anti-counterfeiting applications can be achieved by directional recombination of CsPbX 3 (X = Cl, Br, I) nanowires in different directions. [17] Under different polarization excitation, the anti-counterfeiting pattern will present different patterns, because of the PL intensity difference under different polarized angles. Although the above methods can endow CsPbBr 3 QDs with polarization emission The pursuit of high-resolution and advanced anti-forgery technology has stimulated a growing demand for anti-counterfeiting and encryption strategies with real-time response and high security. Polarized patterns taking the advantage of high security, rapid response, simple operation, and great selectivity enable real-time and non-invasive detection by monitoring in different polarization directions. Here, a new strategy to design and fabricate the polarized CsPbBr 3 quantum dot (QD) line arrays by femtosecond (fs) laser writing in a transparent glass matrix is proposed. The obtained line array structures endow isotropic CsPbBr 3 QDs with macroscopic polarized emission with a polarization degree up to 0.189. Through programable design, the authors have created 2D and 3D polarized luminescent patterns made up of vertical and horizontal lines inside the glass for polarization-sensitive optical anti-counterfeiting patterns. The CsPbBr 3 QD line arrays used in anti-counterfeiting can be well maintained in the water environment. The successful demonstration of the laser writing CsPbBr 3 QD polarization structures in glass highlights the versatility of anti-counterfeiting and encryption.