The invention relates to the field of a high-voltage DC support insulator test, and especially relates to a high-voltage DC support insulator test apparatus, test system and system method. The high-voltage DC support insulator test apparatus comprises en enclosed test container, the test container is internally provided with a group of test positions for installing tested DC support insulators and a public power supply device for supplying test voltages to the tested DC support insulators, and the test apparatus further comprises a breaking apparatus which is corresponding to the test positions and is used for disconnecting the public power supply device from the corresponding tested DC support insulators under a set condition. According to the invention, a group of DC support insulators are tested under the same condition, features of the DC support insulators can be more accurately grasped, and the accuracy of a test result of the DC support insulators is improved.