Insulation resistance detection device, system and method of capacitor

The invention is applicable to the technical field of capacitor detection, and provides an insulation resistance detection device, system and method of a capacitor. The device comprises a current sampling module, a control module, a display module and a power module, wherein the current sampling module is used for sampling a current of a to-be-detected capacitor and a current of a standard capacitor, converting the acquired current of the to-be-detected capacitor to a to-be-detected sampling signal and the acquired current of the standard capacitor to a standard sampling signal and respectively transmitting the to-be-detected sampling signal and the standard sampling signal to the control module, the control module is used for calculating to obtain an insulation resistant value of the to-be-detected capacitor according to the to-be-detected sampling signal and the standards sampling signal and displaying the insulation resistant value on the display module, and the power module is usedfor supplying power to e