The invention discloses an intelligent tester for metering the wiring of a secondary circuit. The intelligent tester comprises a pulse signal device. The output end of the pulse signal device is electrically connected with a signal clip capable of clamping the primary-side terminal of a transformer through a signal line. The intelligent tester further comprises two output clips in clamped cooperation with the secondary-side terminal of the transformer. The two output clips are connected in parallel with a charging capacitor through output lines. A one-way diode is connected in series between the positive electrode of the charging capacitor and the corresponding output line. The positive electrode of the charging capacitor is electrically connected with the input end of a single-chip microcomputer. The output end of the single-chip microcomputer is electrically connected with an alarm. The intelligent tester is reasonable in structure, simple in operation, convenient in detection, time-saving and labor-saving, wherein the intelligent tester can assist in completing the wiring detection of an integrated electric control cabinet transformer. Meanwhile, by means of the intelligent tester, detection results can be quickly judged and the operation can be completed by only one person. Therefore, the detection efficiency is improved.