The invention discloses high-performance building cement and a preparation method thereof, wherein the high-performance building cement is prepared from the following raw materials by weight: 20.4-33.6 parts of sulphoaluminate clinker, 3-5 parts of a bamboo phenol alcohol liquefaction resin, 3-8 parts of an AS resin, 0.5-1.5 parts of carboxymethyl cellulose, 23-47 parts of a core-shell acrylic elastic emulsion, 8-20 parts of waste paper pulp, 3-6 parts of a heat stabilizer, 0.9-4.9 parts of a chemical-resistant modifier, 15-20 parts of 4-hydroxy-3-methoxyphenylethyl alcohol, 10-25 parts of a heat conduction filler, 10-18 parts of slag micro-powder, 0.75-2.65 parts of infrared reflective titanium dioxide, 0.4-0.6 part of a light stabilizer, 0.1-0.8 part of a coupling agent, 0.7-4.3 parts of an accelerator, 4-8 parts of bamboo fiber, 2.5-8.5 parts of silicon nanoparticles, 7-13 parts of nanometer calcium carbonate, and the like. The high-performance building cement of the present invention has advantages of good durability, good weathering resistance, good thermal insulation, and good strength.