Abstract: The present invention is adapted to the technical field of toilet, and provides a foldable portable toilet device, comprising: a seat plate is a plurality of folding parts folded left and right and/or front and back, a folding mechanism provided between the adjacent folding parts; and a groove provided at a bottom of the seat plate and matched with an outer shape of the seat plate of the toilet; a handle provided on a side of the seat plate and provided with a first button through which the folding mechanism is controlled to retract; a plurality of stabilizing means provided within the groove of the seat plate; the stabilizing means locks the portable toilet device onto the seat plate of the toilet. In view of this, the foldable portable toilet device provided by the present invention is portable as well as safe and reliable in use.