The invention discloses an environment-friendly silicon-acrylate emulsion with high color yield and high fastness, and a preparation method thereof. A few of existing silicon-acrylate emulsions are not environment-friendly, a few of existing silicon-acrylate emulsions are poor in fastness, a few of existing silicon-acrylate emulsions are light in color yield, and a few of existing silicon-acrylate emulsions are hard in hand feeling when being applied to textiles. The environment-friendly silicon-acrylate emulsion is formed by emulsion polymerization of an unsaturated acidic monomer, hydrocarbon unsaturated monomers, a double-bond type crosslinking monomer, an environment-friendly functional monomer, a complex monomer and a soft monomer under the action of an initiator, a polymerizable emulsifier, a modifier and a buffering agent in a water phase. According to the unsaturated acidic monomer, the emulsion stability and the coating (pigment) disperse capacity are improved; a good hand feeling can be realized by the hydrocarbon unsaturated monomers and the soft monomer; the brightening property of the polymer film can be greatly improved by the double-bond type crosslinking monomer and the complex monomer; and the fastness of the polymer film is improved by the environment-friendly functional monomer and the polymerizable emulsifier. The environment-friendly silicon-acrylate emulsion with high color yield and high fastness has excellent brightening property and softness and good fastness.