The invention discloses a method for reinforcing cable shielding in a computer, and relates to the field of computer electromagnetic protection. A conductive cloth is tightly wound on a cable, a protective sleeve is used to fasten and wrap the outside of the conductive cloth, and a shielding heat-shrink tube sleeves outside the protective sleeve to tighten the protective sleeve, the conductive cloth and the cable. The length of the protective sleeves on the two ends of the cable is greater than that of the shielding heat-shrink tube. The three shield protection layers are use to shield cable, thereby preventing the holes and seams of the protective sleeve from being damaged, and further improving the shielding effectiveness and providing rainproof protection for an entire machine. The method has the advantages of simple processing ways and easy operation and promotion.