The present invention discloses composite insulator defect non-destructive detection equipment, which comprises: a microwave source for providing a microwave signal; waveguides for conducting the microwave signal provided by the microwave source to an object to be detected; a coupling probe for emitting an incident signal and receiving the reflection signal of the detected object, separating the incident signal and the reflection signal, and transmitting to a receiver; and a receiving device for collecting the transmission signal of the detected object and transmitting to the receiver, wherein the microwave signal provided by the microwave source is a variable frequency microwave signal, the frequency range is 4-30 GHz, the stepping interval is 0.1 MHz, and the composite insulator defect non-destructive detection equipment comprises at least two different specifications of the waveguides. With the composite insulator defect non-destructive detection equipment of the present invention, the defect in the composite insulator can be accurately detected, and the size of the defect can be further analyzed and judged according to the detection results by using the frequency sweep characteristic, such that the composite insulator defect non-destructive detection equipment has universality.