The invention discloses a melt-blown composite plant fiber non-woven skin care mask and a preparation method thereof. The skin care mask is prepared from, by weight, 20-30 parts of plant fibers and 8-12 parts of polyester. According to the preparation method, the plant fibers and the polyester are uniformly mixed and stirred to obtain mixed raw materials, the mixed raw materials are added into a screw extruder and melted into melt by the screw extruder, the melt is extruded from spinneret holes by a spinning die head, melt trickles are cooled, drafted and shaped to form fibers through a drafting air channel under the action of cooling air, the fibers are uniformly adsorbed onto a net forming conveying belt through a diffusion air channel to form a continuous netted fiber layer, the continuous netted fiber layer is prepared into a non-woven fabric by the aid of a hot rolling machine, two side surfaces of the non-woven fabric are coated with nutrition cream, plastic films are fitted with the two side surfaces of the non-woven fabric, the shape of each plastic film is as same as that of a mask fabric, and the non-woven fabric fitted with the plastic film is sealed and packaged to form the skin care mask. The skin care mask has the advantages of good skin care effects, no side effects and the like.