The invention provides a method for displaying color metallographic tissues of pure aluminum and belongs to the technical field of preparation of a metallographic sample. The method comprises the following steps: sequentially grinding the sample by using waterproof abrasive paper with the sizes of 80 meshes, 240 meshes, 400 meshes, 800 meshes, 1000 meshes, 1500 meshes and 2000 meshes; mechanically polishing on a lint dipped with one micron of diamond polishing paste; carrying out vibration polishing on the sample for three hours by using a vibration polishing machine; carrying out anode membrane coating, wherein an anode membrane coating solution is prepared from borofluoric acid and distilled water (the mass concentration of the borofluoric acid is more than 40% and the volume ratio is 1.6%-2.0%), the current density is 0.3-0.5A/cm<2> and the anode membrane coating time is 60-80 seconds; washing and drying by blowing, wherein the clear and bright color metallographic tissues of the pure aluminum can be observed by using a polarizing microscope and the crystal boundary is complete and clear. The method has the advantages of simplicity and convenience for operation, low labor intensity and good coloring effect.