Method for coating propping agent with CO2 dry fracturing functional material

The invention discloses a method for coating a propping agent with a CO2 dry fracturing functional material. The method comprises the following implementation steps: 1) cleaning and drying the surface of a ceramsite or quartz sand propping agent for future use; 2) treating the surface of the ceramsite or quartz sand propping agent by using a silane coupling agent; 3) coating the surface of the ceramsite or quartz sand propping agent treated in the step 2) by using a liquid CO2 thickening agent functional material, and drying for future use. The thickening agent functional material coating the surface of the ceramsite or quartz sand propping agent is consistent with the thickening agent in liquid CO2, and the molecular structures are similar and compatible, so that the self-suspension property of the propping agent is improved; the defect that the conventional CO2 dry fracturing liquid has insufficient sand carrying ability is overcome, the sand carrying effect of the liquid CO2 is improved by putting the prop