The invention discloses slurry for drum paper of a horn. The slurry is prepared from the following components: wood pulp cellulose, cotton fibers, natural silk, wool fibers, bulletproof fibers, nano cellulose, special fibers, glass fibers, coal ash, phenolic resin, hydroxyethyl cellulose, a flow aid and filter aid, a dye, a sizing agent and a dispersant polyoxyethylene (PEO). The slurry is specifically prepared by the following steps: first, defibering and dispersing the wood pulp cellulose, cotton fibers, nano cellulose and the like to prepare mixed fiber slurry; then adding the chemical reagents; making paper through a paper machine; and then preparing the drum paper for the horn containing nano cellulose by means of follow-up and conventional preparation methods of the drum paper. The drum paper prepared by mixing the three fibers has excellent rigidity, soft performance and relatively high Young modulus, so that the clearness of high audio in the drum paper is improved greatly andthe service life of the drum paper is prolonged greatly.