The photovoltaic panel glass (PvPG) in the desert is often subjected to windblown sand erosion, which will produce a large number of microscopic flaws on the glass surface. The surface flaws caused by windblown sand erosion are extremely complex, which significantly affects the mechanical properties and durability of the PvPG. To gain deeper insights into the micro-mechanisms and process evolution of windblown sand erosion on photovoltaic panel glass (PvPG), a microscope observation system was employed to investigate the effects of different wind speeds, sand particle sizes, and windward angles on the geometric parameters of surface erosion craters. A phenomenological statistical probability model for the key geometric parameters of windblown sand erosion craters (crater angle and radius) was established. Furthermore, the erosion evolution process was characterized by examining the relationship between mass loss and fractal dimension. The results indicate that both crater angle and radius follow a normal distribution, and as the erosion duration increases, the fractal dimension gradually increases. However, as the erosion progresses, the growth of the fractal dimension gradually stabilizes. At a windward angle of 60 degrees, the resulting erosion effect is more pronounced compared to the other two angles. Additionally, there is a coupling effect between wind speed and sand particle size, with the most noticeable effect being the increase in crater radius. This method provides a reference for predicting the degradation of photovoltaic panel glass (PvPG) due to windblown sand erosion, and further offers theoretical basis and methodological support for the assessment of degradation and erosion severity of photovoltaic panels in desert regions.