A connection device and a floating connection assembly are provided. The floating connection assembly includes a floating connector and an assembling module. The floating connector includes a floating module and a main body. The floating module defines an assembling region and a plurality of holding regions that are distributed around the assembling region. The main body is inserted into the assembling region of the floating module. The assembling module is retained by the floating module through the holding regions. The floating module and the assembling module are jointly configured to movably clamp a panel, and are jointly movable relative to the panel.