Method and device for testing long-time direct-current insulation impedance of flexible wire for decorative lighting loop

The invention provides a long-time direct-current insulation impedance testing method and device for a flexible wire for a decorative lighting loop. The method comprises the following steps: presetting test parameters, and testing a tested sample under the test parameters; adjusting test parameters, and obtaining multiple groups of test data; wherein the test parameters comprise an output voltage, a leakage current alarm value and test time; and according to the leakage current alarm value and the output voltage, determining the long-time direct-current insulation resistance of the tested sample cable. The beneficial effects of the invention are that the device can achieve the measurement of small size, simple result and precision, has the auxiliary function of setting parameters such as output voltage, leakage current alarm value, test time and the like, also has a remote control starting and stopping function, and achieves the monitoring and visualization of the long-time DC insulation resistance of a wire.