The invention provides an edible fish skin collagen active composite membrane and a preparation method thereof. The edible fish skin collagen active composite membrane comprises components, namely fish skin collagen, beta-cyclodextrin, curcumin, Tween-80 and glycerin. The preparation method comprises the following steps: firstly, mixing and dissolving the curcumin and the beta-cyclodextrin into distilled water with the Tween-80 so as to obtain a curcumin emulsifier solution, secondly, dissolving the collagen into the curcumin emulsifier solution so as to obtain a collagen solution, further adding glycerin as a plasticizer, uniformly stirring, leaving stand to remove gases, moving and paving on an organic glass frame, and drying, so as to obtain the edible fish skin collagen active composite membrane. The edible fish skin collagen active composite membrane provided by the invention is good in antioxidation property, can be biologically degraded, is free of environment pollution, is capable of preventing external microorganism from contacting food, and is capable of inhibiting oxidation rotting of the food, therefore, the effects of preserving food and prolonging the shelf life of the food can be achieved.