The invention relates to a preparation method of a high-property carrier for a copper-based methanol synthesis catalyst, and belongs to the technical field of preparation of catalysts. The high-property carrier is prepared through the following steps of through the adoption of a co-precipitation preparation method, firstly at the temperature of 35-50 DEG C, adding an alkaline solution of which the concentration is 0.5-1.5mol/L to a soluble aluminum salt solution containing modification particles without containing S impurities and Cl impurities, performing a precipitation reaction, controlling the pH value of an end point to be 6.5-7.5, performing ageing for 20-50min, and performing washing with deionized water so as to obtain the high-property carrier. A copper-series methanol synthesis catalyst is prepared through the following working procedures of directly mixing the carrier with a parent stock containing Cu/Zn basic carbonate, performing washing, performing filtration, performing drying, performing calcinations and performing shaping. The carrier disclosed by the invention is environmental-friendly in preparation technology, when the carrier is applied to the preparation of the methanol synthesis catalyst, the obtained sample namely methanol is high in yield, low in impurity selectivity, good in heat stability, suitable for preparing methanol through synthesis gas containing CO, CO2 and H2, and particularly suitable for a large-scale device for synthesizing the methanol with medium pressure.