The invention discloses ageing resistance composite calcium carbonate and a preparation method thereof. The ageing resistance composite calcium carbonate is prepared from calcium carbonate, polyurethane resin, nanometer magnesia, kaolin, epoxy resin, amine resin, rosin resin, cyclohexane, isopropyl alcohol, a modifier and a proper amount of water. The preparation method of the ageing resistance composite calcium carbonate comprises the following steps of 1, preparing a premix for use; 2, preparing a mixed solution; 3, preparing a modifier; 4, mixing the premix, the mixed solution and the modifier, performing uniform stirring, and performing grinding, drying and smashing to obtain superfine powder. The calcium carbonate is combined with materials such as epoxy resin, polyurethane resin, nanometer magnesia and amine resin with the better comprehensive performance, the production technology is improved, and the modifier is adopted, so that the aging resistance of the composite is effectively improved; the composite is simple in production technology, short in production cycle, stable in quality, low in production cost and high in application value.