A detecting device includes a turntable, a rotating device, a sound generating device, and a processing device. The turntable has a first surface and a second surface opposite to the first surface, and the first surface is used to dispose a device to be tested. The rotating device is connected to the second surface of the turntable for driving to rotate the turntable. The sound generating device is used to emit a test audio toward the device to be tested. The processing device is connected to the rotating device and the sound generating device. Among them, the processing device controls a rotational speed of the rotating device to rotate the device to be tested, and controls the sound generating device to emit the test audio to the device to be tested such that the device to be tested may receive the test audio at different angles.