The invention provides a preparation method for an energy-storing and temperature-adjusting phase-change material and fibres thereof. The preparation method for the energy-storing and temperature-adjusting phase-change material is characterized by comprising the following specific steps: placing porous nano-powder, triallyl isocyanurate, polyethylene glycol acrylate, polyethylene glycol and an initiator in solvent water, reacting for 2-5 hours at 65-75 DEG C by means of reduced pressure ultrasonic dispersion, and finally centrifugally dewatering to obtain the energy-storing and temperature-adjusting phase-change material. The energy-storing and temperature-adjusting phase-change material is subjected to drying treatment, then sliced with polymers and blended and granulated through a double-screw extruder, and then subjected to melt-spinning to obtain the energy-storing and temperature-adjusting fibres. The phase-change energy-storing material prepared by the preparation method provided by the invention has the characteristic of high energy-storing and temperature-controlling capacity, and has the advantages of low preparation cost, good heat-resistant stability and simple operation.