The present disclosure provides a wearable display device, a belt buckle and a belt. The wearable display device includes a body; a display screen arranged on the body; a storage module configured to store data; and a controller configured to output a display signal in accordance with the data stored in the storage module, thereby to enable the display screen to display the display signal from the controller. According to the present disclosure, the wearable display device can display stationary or dynamic images, thereby to meet the user's individualized requirements.