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A kind of silicone rubber (SR)/paraffin (Pa)@silicon dioxide (SiO₂)@polydopamine (PDA) phase-change composite was prepared in this work. The double-shelled Pa@SiO₂@PDA phase-change microcapsules were constructed by oxidative self-polymerization of dopamine (DA) in Tris-HCl buffer solution. The effect of the DA content on the properties of Pa@SiO₂@PDA microcapsules and SR/Pa@SiO₂@PDA composites was researched. Due to the protective effect of SiO₂, PDA layer, and SR matrix, the SR/Pa@SiO₂@PDA composites have good leak-proofing performance, and the leakage rate of SR/Pa@SiO₂@PDA-2 is as low as 0.45%. Phase-change enthalpies of the Pa@SiO₂@PDA microcapsules and SR/Pa@SiO₂@PDA composites are reduced slightly with increasing DA content. Meanwhile, the composites displayed improved mechanical strength. The tensile strength of SR/Pa@SiO₂@PDA-2 can be …