The invention discloses a phase-variable energy-storage fiber and relative production, which comprises that using cellulose slurry to prepare cellulose adhesive solution, to be mixed with phase-variable wax fused solution to prepare spinning dope to obtain the phase-variable energy-saving adhesive fiber. The functional fiber is mainly formed by cellulose and wax, while the wax content is 10-40% (relative to the cellulose content). And the inventive production has simple process, significantly reduced phase-variable material loss in the process, improve the phase-variable material content and improve the phase-variable energy-saving function and mechanical function.