Organic-inorganic composite emulsion water-and-oil-repellent finishing agent and application thereof

The invention relates to an organic-inorganic composite emulsion water-and-oil-repellent finishing agent and the application thereof. The preparation method of the finishing agent comprises the following steps of: (1) adding deionized water, composite surface active agent and an ethylene-contained silane coupling agent to a container provided with a stirrer, a reflux condensing tube and a thermometer, stirring at a high speed, adding ammonia, continuously and rapidly stirring and making the material react to obtain a functionalized nano SiO2 aqueous dispersion; and (2) adding the functionalized nano SiO2 aqueous dispersion and parts of monomer emulsified in advance and an initiator to the container provided with the stirrer, the reflux condensing tube and the thermometer, increasing the temperature, slowly dipping the rest monomer emulsified in advance and a fluorinated acrylate monomer, simultaneously dipping the rest initiator, cooling and adjusting the pH value to be 7-8. The finishing agent of the inventi