Chair frame capable of being folded and unfolded

The utility model discloses a chair frame capable of being folded and unfolded. The chair frame comprises a chair seat unit, a chair back unit, two chair leg units, two armrest units, a first connecting rod unit and two pivot rod units. The chair back unit comprises two back rods which are spaced left and right, extend up and down and are pivoted with the chair seat unit; each chair leg unit comprises a front leg rod pivoted to one side of the chair seat unit and a rear leg rod pivoted to the front leg rod and pivoted to the same side of the chair seat unit through a penetrating and sleeving piece; and each armrest unit is arranged on one chair leg unit and is pivoted with one back rod. The first connecting rod unit is pivoted between the two back rods. One end of each pivot rod unit is pivoted with the first connecting rod unit, and the other end of each pivot rod unit is pivoted with one armrest unit. The chair frame has the characteristic of being capable of being unfolded or folded by being operated from