The invention discloses a prefabricated cable for preventing from open circuit of a current transformer and a short circuit of a voltage transformer. The prefabricated cable comprises an open-circuitprevention aviation socket and an open-circuit prevention aviation plug, the open-circuit prevention aviation socket comprises male pins, the outer sides of the male pins are sleeved with insulation sleeves, the outer sides of the insulation sleeves are sleeved with conductive sliding blocks, the open-circuit prevention aviation plug comprises female pins, one ends of the female pins are providedwith pin crimping holes, the male pins can be inserted into the female pins and are electrically connected with the female pins, and there are the plurality of male pins and female pins which are in one-to-one correspondence, and the male pins can be selectively electrically connected. The prefabricated cable is flexible in structure after production is completed, and can be increased and decreased as required; and moreover, the product structures are not uniform, and can be interchangeably used among different specifications.