The invention solves the technical problem so as to provide a compound color retention agent for cheese powder processing and a color retention processing method thereof. The compound color retentionagent for cheese powder processing is characterized by comprising the following components according to the usage amount: 0.1 to 0.3 percent of methionine, 0.2 to 0.4 percent of zinc citrate, 0.2 to 0.4 percent of zinc carbonate, 0.01 to 0.05 percent of zinc oxide, and 0.01 to 0.05 percent of lactic acid, wherein the proportion is calculated according to the weight of a raw material slurry beforethe powdering of cheese powder, and the components are compounded to achieve the effect. The color retention processing method of the cheese powder comprises the steps of sufficiently dissolving the color retention agent into 40 to 60 percent of water solution, preserving heat at 80 to 90 DEG C, and storing for standby use; after finishing melting and emulsifying of the raw material slurry beforethe powdering of the cheese powder, stirring and heating to 85 to 95 DEG C, then adding the color retention agent solution into the slurry, preserving heat and stirring for 1 to 10min, then pumping out all slurry into a gradient cooling machine, and accomplishing gradient cooling; and then preserving heat, stirring, buffer waiting, spray drying and powdering. The compound color retention agent isused for combined action so as to realize a color retention function, the color change rate is lower than 3 percent, and a color retention process effect is greatly strengthened.