The invention relates to the field of maintenance and measurement of high-voltage capacitors of an electric power system, in particular to a measuring loop without lead detaching of a high-voltage capacitor. The measuring loop is characterized in that the measuring loop comprises a power transformer, a voltage pick-up loop and a current pick-up loop, the input end of the power transformer is connected with 220V alternating currents, and the output end of the power transformer is respectively connected with the voltage pick-up loop and the current pick-up loop; the voltage pick-up loop is provided with a resistor R1 and a resistor R2 which are connected in series, a voltage collecting point of a processor is arranged between the resistor R1 and the resistor R2, the current pick-up loop is provided with a resistor R3 and a measured capacitor CX which are connected in series, and the current pick-up loop is provided with a current collecting point of a wireless current sensor. Compared with the prior art, the measuring loop has the advantages that the cumbersome work for detaching and setting up leads is omitted due to the fact that the lead does not need to be detached, labor intensity is lowered, a measurement result is accurate so that a tester can conveniently and accurately judge a failure place, measuring lines do not need to be detached or connected at high positions, and electric shock risks are greatly lowered.