The utility model discloses an annunciator bulb testing device which comprises the components of a single-chip microcomputer device which has a model number of STC89C52; the annunciator bulb circuit is electrically connected to the single-chip microcomputer device and comprises a main filament and an auxiliary filament; the LED display panel is electrically connected to the single-chip microcomputer device, and the LED display panel is used for displaying the bulb test process and the test type; wherein the relay device and the power supply device are electrically connected to the single-chipmicrocomputer device, the relay device is electrically connected with the annunciator bulb circuit, and the relay device switches the test of the main lamp filament and the auxiliary lamp filament through the connection and disconnection of an internal coil. The automatic test box for the signal lamp bulbs can complete manual test of the automatic test box for the signal lamp bulbs through the single-chip microcomputer device, can also complete switching test of the main lamp filament and the auxiliary lamp filament through the single-chip microcomputer device and the relay device, can measurea plurality of bulbs at a time, and has an efficient and accurate test effect.