Hydration products of sulphoaluminate cement were used to produce the phase change material of polyethylene glycol. A kind of cement-based composite phase change materials（CPCMs） with high polyethylene glycol content was prepared by the steps of hydration and crystallization， taking advantage of the water solubility of polyethylene glycol and the hydraulic property of sulphoaluminate cement. The microstructure， chemical compatibility， crystal structure， phase change properties， thermal stability and cooling performance of CPCMs with different polyethylene glycol contents were systematically analyzed. The results show that polyethylene glycol is well distributed in the porous network structure of hydration products with high loading capacity. Polyethylene glycol and hydration products of sulphoaluminate cement have good chemical compatibility with no chemical reaction between them. CPCMs have good thermal stability under 250 ℃， indicating that the CPCMs can be used to construct phase change thermal storage asphalt pavement. The phase change enthalpy of CPCMs with polyethylene glycol mass fraction of 36.36% can reach up to 62.48 J/g， the surface temperature of which reduces by 7.3 ℃ compared with the control group sulphoaluminate cement.