The invention discloses a composite cable insulating property testing device, and belongs to the technical field of cable insulating property testing. The device comprises a super-low frequency high-voltage generator Z, a super-low frequency testing circuit and an intermediate frequency testing circuit, wherein a storage battery power supply E is used for supplying power to the super-low frequency high-voltage generator Z. The intermediate frequency testing circuit comprises an LC testing main circuit, an electric leakage detection circuit, a partial discharge detection circuit, a charging voltage detection circuit, and an intermediate frequency testing control circuit. The device is small in size, is light in weight, is portable, is convenient to operate, and is low in manufacturing cost.