The invention discloses a high-strength environment-friendly brick and a preparation method. The high-strength environment-friendly brick is prepared from the following raw materials in parts by weight: 20-50 parts of natural shale, 10-15 parts of gray stone, 30-60 parts of calcite, 40-80 parts of bentonite, 30-60 parts of building wastes and 50-80 parts of waste rock. The high-strength environment-friendly brick and the preparation method provided by the invention have the advantages of high pressure resistance, high fracture resistance, beautiful appearance, low cost and no environmental pollution.