The invention provides a pipe bracket thermal-insulation material, and a preparation method thereof. According to the preparation method, by weight, 5 to 20% of a mesoporous material, 2 to 15% of expanded vermiculite, 0 to 10% of floating bead, 0 to 10% of glass bead, and 5 to 25% of ceramsite are taken as main materials; high-alumina cement, bonding clay, water glass, fly ash, magnesium oxide, and aluminium oxide are taken as a bonding curing agent; a water reducer, vulcanic ash, silicon ash, and alkali resistant fiber are taken as an additive; and an appropriate amount of water is added forpreparation; the amount of the bonding curing agent ranges from 30 to 45%, and the amount of the additive ranges from 3 to 15%. Compared with conventional pipe bracket thermal-insulation materials, the advantages are that: material thermal insulation performance, compressive strength, and fireproof grade are improved, and are better than that of expanded vermiculite pipe bracket thermal-insulationmaterials; and compared with polyurethane, the main advantage is that A1 grade non-combustion is achieved.