Nasal spray for efficiently filtering and preventing air pollutants and preparation method thereof

The invention discloses a nasal spray for efficiently filtering and preventing air pollutants. The nasal spray for efficiently filtering and preventing air pollutants is prepared from the following components: an onion and/or garlic extract, natural sea salt, hyaluronic acid (200 kDa to 600 kDa) and ultrapure water. The invention further discloses a preparation method of the nasal spray for efficiently filtering and preventing air pollutants. The content of organic sulphides in a natural plant extract in the product disclosed by the invention is 70% or above through detection, the content of an active protein polypeptide ingredient reaches 10mu g/mg through BCA-method detection, and the extraction efficiency reaches 60% or above; filtering efficiency for inhalable particles in air reaches 50-75%.