An electrical testing device used for testing an electronic device under test. The electrical testing device includes a cable configured for receiving a test signal and transmitting the received test signal therethrough, and a testing unit connected to the cable and configured for analyzing the test signal. The cable includes a flexible body, a number of first connectors connected to an end of the flexible body configured for receiving a test signal from the electronic device under test, and a second connector connected to the other end of the flexible body configured for transmitting the test signal between the flexible body and the testing unit.