Ice accumulation severely threatens the reliable operation of outdoor optical windows. Existing research has primarily developed two strategies: slippery coatings for passive ice removal by reducing ice adhesion, and photothermal coatings for active ice melting via photothermal conversion. However, the former mostly rely on slippery liquid-infused porous surfaces (SLIPS), which are prone to failure due to lubricant depletion; the latter (such as carbon-based materials and MXenes) sacrifice optical clarity because of their broad-spectrum absorption and opacity. To address these bottlenecks, this paper reports a novel coating technology that integrates three functions: solid-state sliding, high transparency, and highly efficient photothermal properties. By designing a phenyl/methylsiloxane cross-linked network and free PDMS segments, a solid slippery property (sliding angle of 16°) without liquid lubrication is achieved. Distinct from the broad-spectrum absorption of carbon-based and MXene materials, this study introduces cesium tungsten bronze (CsxWO3) nanoparticles, whose localized surface plasmon resonance peak is situated in the near-infrared region with almost no absorption of visible light, thereby achieving efficient photothermal conversion (heating up to 86.5 °C under 1 sun illumination) while maintaining a visible light transmittance higher than 83%. The coating synergistically integrates passive anti-icing and active de-icing, achieving a low ice adhesion strength of 56.8 kPa, an icing delay time of 121 s at -20 °C, and a 46.4% increase in ice-melting efficiency compared to conditions without photothermal effects. Moreover, the coating exhibits excellent mechanical durability (stable performance after 1000 friction cycles) and long-term chemical stability. Notably, benefiting from the selective absorption characteristics of CsxWO3, the coating can effectively block near-infrared thermal radiation in summer (reducing the temperature inside a model house by 19.9 °C), demonstrating its potential for year-round thermal management. This work achieves the first integration of solid-state sliding, high transparency, and highly efficient photothermal characteristics, realizing a synergistic effect of passive and active anti-icing/de-icing. It provides an all-weather solution for outdoor optical windows that require both high transparency and anti-icing performance, such as automotive autonomous driving optical sensors, UAV optoelectronic pods, and BIPV photovoltaic curtain walls.