Fully inorganic perovskites cesium lead halide (CsPbX₃, X = Cl, Br, I and Cl/Br and Br/I mixed halide systems) nanocrystals (NCs), representing bright and tunable photoluminescence, have been widely studied and recognized as promising materials for optoelectronic devices in recent years. In spite of the excellent luminescent properties of CsPbX₃ NCs, their instability and the colloidal characteristics are still the important issues which obstruct their practical applications. In this paper, a novel CsPbX₃ epoxy resin (ER) composite combining with the Y₃Al₅O₁₂:Ce³⁺ (YAG:Ce³⁺) phosphor-in-glass (PiG) was fabricated by tape-casting techniques, which demonstrated to be the material of favorable thermal insulation and high refractive index effectively enhanced the stability of CsPbX₃ NCs and realized the warm lighting tuning for YAG:Ce³⁺ phosphor with white light-emitting-diodes (WLED). Importantly, the red CsPbX₃-ER film on the Ce-PiG substrate (Ce-PiG & CsPbI₂Br-ER) composite with the stacking geometric configuration fabricated by tape-casting was designed to solve red deficiency problem. The Ce-PiG & CsPbX₃-ER composite showed an excellent stability and it sustained the luminescent properties of CsPbX₃ NCs. Interestingly, the green-red light radiated by Ce-PiG can excite CsPbX₃ perovskite effectually. We obtained a high-performance WLED with a CRI of 90.5, a CCT of 4067 K, a LE of 42.12 lm/W and ${\text{D}}_{\mathrm{\mu }\mathrm{\nu }}$ of 0.0054 under 20 mA current driving. Accordingly, this as-obtained CsPbX₃-ER composite reveals the prominent feasibility of the present luminescent materials in solid-state warm lighting source.