Folding chair with supporting pad

A folding chair with a supporting cushion comprises a chair frame mechanism and a back cushion mechanism. The chair frame mechanism can be driven to be switched between an unfolded state and a folded state and comprises a seat unit, a chair back unit installed on the upper side of the seat unit and a supporting unit installed on the chair back unit. The supporting unit is provided with a ridge rod which extends up and down and is located on the rear side of the chair back unit. The back cushion mechanism is installed on the supporting unit and comprises a movable seat and a supporting cushion, wherein the ridge rod is sleeved with the movable seat in an up-down shifting mode, and the supporting cushion is installed on the movable seat. When the chair frame mechanism is in the unfolded state, the supporting pad can abut against the chair back unit forwards. Through the arrangement of the back cushion mechanism, a user can freely adjust the height of the supporting cushion, so that the head, the neck or the wai