Preparation method of radiation cooling material capable of cutting solar spectrum

The invention provides a preparation method of a radiation cooling material capable of cutting a solar spectrum, which comprises the following steps: putting a proper amount of inorganic nano powder into an alkaline solution with NaOH as a solute, absolute ethyl alcohol as a solvent and a pH value range of 8-10, carrying out ultrasonic treatment in an ultrasonic cell crusher, adding a KH-570 silane coupling agent solution with the mass fraction of 20%, and carrying out magnetic stirring; the mixed solution is placed in a silicone oil bath pan at the temperature of 60 DEG C, solvent and solute separation is carried out in a centrifugal machine after magnetic stirring, the obtained solute is repeatedly washed with absolute ethyl alcohol for three times, suspension liquid is prepared from the washed solute with deionized water, the suspension liquid is placed in a vacuum drying box at the temperature of 70 DEG C, vacuum drying is carried out, and the modified inorganic nanometer cooling particles are obtained. T