Microprism arrays are extensively utilized across various industries. Glass-based microprisms, in comparison to polymers, offer superior corrosion resistance, thermal stability, and durability. However, the isotropic nature of glass makes micromachining into prism-like structures challenging. In this paper, we introduce a novel interfacial erosion-induced quasi-anisotropic wet etching technique to manufacture glass microprism arrays efficiently and cost-effectively. For the first time, interfacial erosion is analyzed within a metacellular automaton to study the wet etching process, uncovering the dynamics between side etching and interfacial erosion and their impact on the side wall profiles. This approach yields varied microstructures with tilted morphologies. Leveraging quasi-anisotropic etching characteristics, we successfully produce microprism arrays with adjustable spacing, shape, and size, achieving 98% repeatability between arrays. Our method significantly enhances LED lamp diffusion, increasing average brightness by 4.6 times. This research not only pioneers a new direction in glass wet etching but also incorporates quasi-anisotropic properties into the traditional isotropic framework, presenting a straightforward, economical technique for fabricating glass microprism arrays and similar devices.