The invention discloses a section aluminum fluorocarbon spraying automatic paint mixing method. The method comprises the steps of diluting coating to be sprayed to the maximum viscosity to form firstdiluted coating through a first solvent, and diluting the coating to the maximum viscosity to form second diluted coating through a second solvent; setting the use amount of the coating required by anobject to be coated; measuring the air temperature of a spray room in real time; calculating the mixing ratio of the first diluted coating and the second diluted coating according to the air temperature; pumping the first diluted coating and the second diluted coating according to the use amount of the coating and the mixing ratio; mixing the pumped first diluted coating and the pumped second diluted coating evenly and spraying the coating onto the objected to be coated. The invention further discloses a section aluminum fluorocarbon spraying automatic paint mixing system. Through the sectionaluminum fluorocarbon spraying automatic paint mixing method and system, proportion adjustment of the diluted coating is achieved by measuring the air temperature and humidity of the spray room in real time; integration of paint mixing and spraying is achieved; the solvent ratio is more accurate, and the use amount of the diluted coating is accurate.