A testing device with power protection includes a power interface and a testing platform. The testing platform includes a casing, a fixed frame and a sliding frame. The power interface is disposed at one surface of the casing. The fixed frame covers the power interface. One side of the fixed frame formed with an entrance that exposes the power interface outwards from the fixed frame. The sliding frame includes a rack body slidably that is located on the casing, and a shielding door that is rotatably connected to the rack body for covering the entrance of the fixed frame. When the rack body is slid towards the power interface so as to rotate the shielding door away from the entrance by the fixed frame, the power interface is exposed outwards from the fixed frame through the entrance.