The invention provides a preparation method for a pitaya peel-based edible packaging film. The preparation method is characterized by comprising the following steps: (1) washing and stripping and
slicing pitaya peels; (2) performing
blanching treatment; (3) adding water and pulping to obtain pitaya peel pulp, wherein the
mass ratio of matter obtained in the step (2) to the water is (15 to 45):100; (4) adding a
thickening agent and a
plasticizer into the pitaya peel pulp, wherein the
mass ratio of the
thickening agent to the pitaya peel pulp is (0 to 0.4):100, and the
mass ratio of the
plasticizer to the pitaya peel pulp is (0 to 0.3):100; the
thickening agent is
sodium alginate or
sodium carboxymethylcellulose, and the
plasticizer is glycerinum or
sorbitol; (5) performing homogenization treatment at a
treatment rate of 15000 to 20000 r / min for 5 to 8min; then, performing degassing treatment and standing to obtain shaped pulp; (6)
casting and
drying, and then performing film uncovering to obtain the pitaya peel-based edible packaging film. The invention also provides the packaging film prepared by the preparation method.