A testing device for testing an electronic device includes a base, a testing mechanism, a pushing mechanism, and a fastening mechanism. The testing mechanism is rotatably fastened to the base and can be rotated from a first position to a second position. The fastening mechanism is mounted on the base. The pushing mechanism is rotatably mounted on the testing mechanism. When the testing mechanism is rotated from the first position to the second position, the pushing mechanism is rotated and pushes against the testing mechanism. The testing mechanism is connected to an electronic device. The testing mechanism is positioned in the second position via the fastening mechanism.