Antifogging agent, preparation method and application thereof, and antifogging product

The invention relates to the technical field of polymers, in particular to an antifogging agent, a preparation method and application thereof and an antifogging product. The antifogging agent is prepared from the following components in percentage by weight: 0.5 to 10 percent of modified polyvinyl alcohol, 0.1 to 5 percent of perfluoroalkyl quaternary ammonium salt, 0.1 to 5 percent of polyvinylpyrrolidone and 80 to 99.3 percent of ethanol aqueous solution, wherein the modified polyvinyl alcohol is selected from at least one of polyvinyl alcohol ester sulfonate, polyvinyl alcohol sulfonate and polyvinyl alcohol ester benzene sulfonate. The antifogging agent provided by the invention has the advantages of high transparency, long-acting antifogging, water resistance and the like, and particularly, by limiting the weight ratio of the modified polyvinyl alcohol to the perfluoroalkyl quaternary ammonium salt to the polyvinylpyrrolidone to the ethanol aqueous solution, the transparency, the antifogging performance,