The invention discloses a method for producing a preblended light aggregate concrete heat-preservation material. The heat-preservation material is prepared by uniformly mixing and blending spherical light aggregate, fine aggregate, cement, admixture and additives, wherein the fine aggregate is one or more of sand, pottery sand, tailing sand, steel slag and water-quenched slag; the admixture is coal ash and / or mineral powder; the additives comprise a water reducing agent and a water retaining agent; the production raw materials of the spherical light aggregate comprise sludge and mud; the production process comprises steps of blending, pelleting, screening, drying, combusting to puff, cooling in air and cooling naturally. The raw materials used in the heat-preservation material produced by using the method disclosed by the invention are all anti-combustion materials, so that a heat-preservation structure manufactured by using the heat-preservation material is good in fireproof function; as the spherical light aggregate is of a porous structure, good heat preservation and sound insulation effects are achieved. When being applied to heat-preservation construction of roofs or building surfaces, the heat-preservation material is only provided with a proper amount of water, is uniformly mixed and blended, and is subsequently paved on the ground or the roof, and then an integrated heat-preservation structure is formed after the heat-preservation material is cured. The strength of the heat-preservation structure is greatly improved, and the heat-preservation construction is also convenient.