The invention belongs to the technical field of biomass resources and discloses a biomass material based on palm silks and palm meal and a preparation method thereof. The biomass material based on the palm silks and the palm meal contains the following components in parts by weight: 35-60 parts of palm silks and palm meal, 30-40 parts of crop stalk, 5-10 parts of sticky rice juice and 5-15 parts of nitrogen source substance. The biomass material and the preparation method disclosed by the invention have the advantages that the method is simple, and no chemical adhesive is added in the whole process, so that the biomass material is ecological and environment-friendly. Related indexes of the prepared biomass material are equivalent or superior to the quality standard of national standard GB/T4897-2015 of a shaving board. Safe environment-friendly purely-natural fungal mycelium is used as the adhesive to prepare the palm silks and palm residue into the biomass material, so that the resource utilization of the palm silks and the palm residue is realized.