The present invention relates to an automatic testing apparatus used for testing a tested device. The automatic testing apparatus is fixed on a first side of a testing platform. The tested device executes a testing program while being tested, and transmits a test signal to a control unit of the testing platform for controlling a driving testing unit or a multimedia testing module to test the tested device and hence testing the tested device automatically. Thereby, testing costs can be saved and artificial factor affecting the test results can be avoided.