The invention discloses low-VOC (volatile organic compounds) odorless stain-resistant emulsion paint for interior walls and a method for preparing the low-VOC odorless stain-resistant emulsion paint. The low-VOC odorless stain-resistant emulsion paint is made of pure acrylic emulsion, rutile titanium dioxide, silicon micropowder, diatomite, dispersing agent, antifoaming agent, antifreezing agent, film forming auxiliary, stain-resistant agent, antiseptic mould inhibitor, thickener, pH (potential of hydrogen) modifier and water. The preparation method includes: adding the components into a reactor and well mixing to obtain the emulsion paint. The low-VOC odorless stain-resistant emulsion paint for interior walls is accordant with the limited quantity of harmful substance in interior wall paint of indoor decoration materials GB/18582-2008, and is low in VOC content, odorless, free of indoor air pollution, capable of purifying air, fine in stain resistance effect of formed emulsion films, applicable to indoor decoration of various places, and especially applicable to decoration of interior walls of household, hospitals, schools and the like.