A composite chair storage device includes a chair, a slide mechanism and an exercise module for storing a composite chair. A first roller and a second roller are embedded into two slide rails for performing linear displacement. With the assistance of a sliding third roller and a pressure element capable of turning over an exercise equipment of an exercise module, the exercise module can be stored into a containing space of the chair or unfolded from the containing space of the chair quickly and conveniently, to achieve the effect of folding and unfolding the composite chair effectively.