In response to the degradation of slip and anti-blocking properties in linear low-density polyethylene (LLDPE) films under high-temperature or long-term storage conditions, LLDPE/erucamide and LLDPE/SiO2/erucamide masterbatches were prepared via twin-screw extrusion. Films with varying proportions of SiO2 and erucamide were produced using the blown film process. The effects of different storage temperatures and durations on the slip/anti-blocking performance and optical properties of the films were systematically investigated. The results demonstrate that erucamide alone significantly reduces the static (μs) and kinetic friction coefficients (μk) of LLDPE films. Moreover, the SiO2-erucamide composite system exhibits a notable synergistic effect, effectively mitigating the decline in anti-blocking performance under extreme temperature or prolonged storage conditions. When the SiO2 content is 0.199%, the films exhibit excellent slip performance and reliable anti-blocking property across a broad temperature range (-10, 25, 50 ℃). The SiO2 particles are uniformly dispersed in both the masterbatch and the resulting films, serving as nucleating agents for LLDPE and contributing to the long-term stability of the slip and anti-blocking performance.