NOVELTY - A chromium-aluminum-manganese oxide high-temperature solar energy-absorbing composite functional powder coating is prepared by mixing mixed material comprising chromium trioxide, aluminum oxide and manganese chloride tetrahydrate, silicone resin 1053 as binder and propanetriol as dispersant, wet grinding, dispersing, spray-drying to obtain functional powder, adding stannic chloride as tin source into anhydrous ethanol as solvent, adding glacial acetic acid, adjusting pH, spraying into functional powder, preheating, spraying nickel-aluminum layer, recooling, baking and annealing.    USE - Method for preparing chromium-aluminum-manganese oxide high-temperature solar energy-absorbing composite functional powder coating (claimed).    ADVANTAGE - The coating has stable performance and good fluidity and thermal shock resistance.    DETAILED DESCRIPTION - A chromium-aluminum-manganese oxide high-temperature solar energy-absorbing composite functional powder coating is prepared by:    (A) taking mixed material comprising 55% chromium trioxide, 35% aluminum oxide and 10% manganese chloride tetrahydrate, silicone resin 1053 as binder and propanetriol as dispersant;    (B) mixing mixed material, binder, dispersant and deionized water at ratio of 500:10:2:1000 for 40-60 minutes to obtain slurry, wet grinding and dispersing for 1 hour;    (C) spray-drying at air inlet temperature of 160-170 degrees C, air outlet temperature of 40-60 degrees C, feeding speed of 800 revolutions/minute (rpm) and spraying speed of 17000-20000 rpm to obtain functional powder having particle size of not less than 50 mu m;    (D) adding stannic chloride as tin source into anhydrous ethanol as solvent, adding 0.5 mol/L glacial acetic acid, adjusting pH to 4-5 and spraying into functional powder; and    (E) preheating to 90-120 degrees C, spraying nickel-aluminum layer, recooling to 90-120 degrees C to obtain tin oxide on surface to thickness of 25-30 mu m, baking at 100-120 degrees C for 20 minutes at speed of 20 mm/minute and annealing at 550 degrees C for 2-2.5 hours.