The invention relates to a full-dull colorful insulation polyester membrane, which is prepared by matt film polyester chips, color master batches, and master batches containing silicon oxide, while the three materials are mass rationed as 20-30 accounts of matt film polyester chip, 2-6 accounts of color master batches, and 2-6 accounts of the master batches containing silicon oxide. The inventionhas the advantages that 1, the product is hard to lose color and be polluted in the insulation applications as electron, wire and electric fields, the membrane is easily to be sliced, with high electric strength and good insulation, 2, the membrane has flat and smooth surface, 3, the invention can prepare insulation polyester membranes with different colors.