A floating image display device comprises a floating image display module and a signal processing module. The floating image display module has a first upper assembling surface and a first lower assembling surface, and comprises a first pin located on the first lower assembling surface. The floating image display module is configured to form a floating image. The signal processing module has a second upper assembling surface and a second lower assembling surface, and comprises a plurality of second pins located on the second upper assembling surface. One of the plurality of second pins is detachably connected to the first pin. The signal processing module is configured to identify the floating image display module according to the position of the first pin corresponding to the plurality of second pins, and transmit a display signal associated with the floating image to the floating image display module through the first pin.