The invention discloses a weather-proof, moisture-proof and fireproof multifunctional mat and a preparation method thereof. The weather-proof, moisture-proof and fireproof multifunctional mat comprises a mat body, a first functional layer arranged on the upper surface of the mat body, a second functional layer arranged on the lower surface of the mat body and an anti-skid elastic layer arranged on the lower surface of the second functional layer. The first functional layer and the second functional layer are mutually independently prepared from the following components in parts by weight: 60-80 parts of methyl vinyl silafluorene / N-vinyl carbazole / acrylonitrile / glycidyl methacrylate copolymer, 3-5 parts of 2, 2-bis (3-amino-4-hydroxyphenyl) hexafluoropropane, 10-20 parts of epoxidized natural rubber, 10-20 parts of 2, 2-bis (3-amino-4-hydroxyphenyl) hexafluoropropane, 10-20 parts of 2, 2-bis (3-amino-4-hydroxyphenyl)-1, 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate, 10-20 parts of 2, 2, 4-trimethyl-1, 3- The adhesive comprises the following components in parts by weight: 3-5 parts of 2, 4-diamino-6-phenyl-1, 3, 5-triazine, 8-15 parts of filler, 1-3 parts of a dispersing agent, 1-2 parts of a defoaming agent and 20-30 parts of a solvent. The weather-proof, moisture-proof and fireproof multifunctional mat is good in performance stability, sufficient in weather-proof, moisture-proof and fireproof performance and long in service life.