An embodiment of the utility model provides a current transformer secondary wiring detection device that take a percentage more, include: power end, voltage regulator, isolation transformer, first ampere meter and second ampere meter, power end, voltage regulator and isolation transformer are consecutive, wherein, isolation transformer includes two outputs, with await measuring take a percentage among the current transformer more wantonly two transformation ratios non - the biggest take a percentage continuous, first ampere meter, with arbitrary output of isolation transformer links to each other, the second ampere meter, with await measuring and take a percentage among the current transformer the biggest two of transformation ratio more and take a percentage continuously. Have higher security, and implement more simple swiftly.