The invention discloses a reflection-deducting coating liquid with blended soft and hard particles as well as a preparation method and application of the reflection-deducing coating liquid. The method comprises the following steps: (1) preparing hard emulsion particles, namely fully mixing an emulsifying agent with water, adding monomers for forming the hard emulsion particles and a cross-linking agent into an emulsifying agent aqueous solution, adding an initiator and residual water, reacting and performing heat preservation, thereby obtaining a hard emulsion particle aqueous dispersion; (2) preparing soft emulsion particles, namely fully mixing an emulsifying agent with a part of water, adding monomers for forming the soft emulsion particles into an emulsifying agent aqueous solution, adding an initiator and residual water, reacting and performing heat preservation, thereby obtaining a soft emulsion particle aqueous dispersion; and (3) mixing the hard emulsion particle aqueous dispersion with the soft emulsion particle aqueous dispersion, thereby obtaining the reflection-deducting coating liquid with the blended soft and hard particles. According to the coating liquid, the soft particles and the hard particles are blended to form a nano rough surface on the surface of a dacron fabric, so that reflection deduction and densification of dacron are realized and the coating liquid has extensive application prospect.