NOVELTY - Highly-elastic non-supported environmentally-friendly gel mask, is claimed. The gel mask is prepared by dissolving an olefin monomer M1, a biopolymer M2, a chemical cross-linking agent M3, a physical cross-linking agent M4, plant extract essential oil, whitening component and anti-aging active component in water, and polymerizing.    USE - The gel mask is useful in the fields of skin care, moisture retention, beauty treatment and anti-aging.    ADVANTAGE - The gel mask does not need the application of a non-woven fabric to improve the mechanic strength, and allows the viscoelasticity, the skin endophilicity and the moisture retention performance of the mask to be adjusted by adjusting the monomer concentration, the feeding ratio, the whitening and anti-aging active components, the reaction temperature, the water content and the feeding sequence (all claimed); has moderate viscosity, good elasticity, good ductility and toughness, carrying convenience, adjustable thickness, and repeatable use.    DETAILED DESCRIPTION - Highly-elastic non-supported environmentally-friendly gel mask, is claimed. The gel mask is prepared by dissolving an olefin monomer M1, a biopolymer M2, a chemical cross-linking agent M3, a physical cross-linking agent M4, plant extract essential oil, whitening component and anti-aging active component in water, and polymerizing. The olefin monomer M1 is acrylamide, methacrylamide, N-isopropyl acrylamide, N-methylol acrylamide, 2-(dimethylamino)ethyl-methacrylamide, 2-hydroxyethyl methacrylate, N-vinyl pyrrolidone, acrylate, methacrylic acid, t-butyl acrylate, sodium acrylate, 2-acrylamido-2-methyl-1-propionic acid, polyethylene glycol monomethacrylate and/or their salts; biopolymer M2 is sodium alginate, chitosan, xanthan gum, humic acid, cellulose, lactic acid, polylysine, polyglutamic acid, polyvinyl alcohol, polyhydroxy fatty acid ester, polyanhydride, collagen and/or colloidal immunoglobulin; chemical crosslinker M3 is N,N'-methylene bisacrylamide, di(ethylene glycol) dimethacrylate, diglycidyl ether, epichlorohydrin or glutaraldehyde; and the physical cross-linking agent M4 is magnesium hectorite, hectorite, magnesium soapstone, zinc soap stone or lithium magnesium silicate. An INDEPENDENT CLAIM is also included for preparing the gel mask, comprising: (i) adding olefin monomer M1, biopolymer M2, chemical crosslinker M3 and physical crosslinking agent M4 into deionized water, formulating into 10-15% solution, adding a functional monomer, stirring for 5-25 minutes, and mixing until a homogeneous viscous solution A is formed; (ii) adding plant extract essential oil, whitening component and anti-aging active component into the deionized water, magnetically stirring for 3-10 minutes, until uniform dispersion solution B is formed; (iii) adding solution B into solution A, magnetically stirring for 5-15 minutes until homogeneous viscous liquid is formed, adding initiator ammonium persulfate or potassium persulfate, and catalyst tetramethylethylenediamine or sodium sulfite to prepare prepolymer solution; (iv) pouring the resulting prepolymer solution into facial shape mold of thickness 0.1-5 mm, polymerizing at 40-70 degrees C for 1-4 hours, to obtain the gel mask; and (v) heat sealing the gel mask and packing.