Tungsten-doped vanadium dioxide@poly(dopamine) modified polyurethane solid-solid phase change material (W-VO2@PDA/PUPCM) was prepared by in situ polymerization using polyethylene glycol (PEG) as the soft segment, isophorone diisocyanate (IPDI) as the hard segment and polydopamine-coated tungsten-doped vanadium dioxide (W-VO2@PDA) as the filler. The effect of PEG molecular weight on the stability of W-VO2@PDA/PUPCM emulsions and the temperature regulation of the finishing fabrics was investigated. The chemical structure, crystallization properties, phase change properties and thermal stability of W-VO2@PDA/PUPCM were tested and characterized by FT-IR, POM, DSC and TGA. The results showed that the molecular weight of PEG had a great influence on the thermal storage and phase change properties of W-VO2@PDA/PUPCM. When the molecular weight of PEG was 8000, W-VO2@PDA/PUPCM had good shape stability and thermal stability, and the highest melting temperature(51.52 ℃) and phase change enthalpy(144.82 J/g). The maximum temperature difference between the W-VO2@PDA/PUPCM finished fabric and unfinished fabric was 7.8 ℃ and 5.3 ℃ during the heating and cooling process. W-VO2@PDA/PUPCM finished fabric has a wide range of application prospects in the field of intelligent temperature control fabrics.