The invention relates to a grader for coffee beans and a grading method, and belongs to the technical field of agricultural material sieving equipment. The grader for coffee beans comprises a feedingpart, a material
evening sieving part, a grading part, an air blowing part, a collecting part, an
electric control box and an
air pump, wherein the feeding part is communicated with the material
evening sieving part; the feeding part comprises a rack I, a hopper, a vibrating motor I and a mixed object collector I; the material
evening sieving part comprises a rack II, a vibrating
bed, a vibratingmotor II and a mixed object collector II; the grading part comprises CCD cameras, a
microprocessor, a sealed box, a light supplementing lamp and a cleaner; the air blowing part comprises air tube pillars, an
electromagnetic valve and an
air pump; the collecting part comprises a collecting box I, a collecting box II, a collecting box III, a collecting box IV and a collecting box V. With the graderfor coffee beans, the coffee raw beans can be graded according to particle diameters, baked coffee beans are graded according to colors, the efficiency of sorting the coffee beans is improved, and labor intensity is lowered.