Method for measuring locking time of phase-locked loop

The invention provides a method for measuring the locking time of a phase-locked loop. The method comprises the following steps: the phase-locked loop is locked in a first frequency and a second frequency respectively, and first output voltage of the phase-locked loop in the first frequency and second output voltage of the phase-locked loop in the second frequency are measured by ATE (automatic test equipment); the phase-locked loop is hopped to the second frequency from the first frequency, and the ATE acquires and processes output voltage of the phase-locked loop in the hopping process; and the locking time of the phase-locked loop is calculated according to the output voltage processing result of the ATE. An externally hung discrete instrument is not required, the output voltage of the phase-locked loop in the hopping process from the first frequency to the second frequency is directly acquired by the ATE, and the locking time of the phase-locked loop is directly calculated according to the output voltage processing result, so that the measuring efficiency is increased greatly.