The invention discloses a portable folding scooter. The portable folding scooter comprises a handle, a first folding mechanism, a second folding mechanism, a bottom support frame provided with a pedal, a seat, and a front fork provided with a support shaft; a front wheel is mounted on the front fork; a bearing head pipe for sleeving the support shaft to steer the front wheel is arranged at the front end of the bottom support frame, and a rear wheel is mounted at the back end of the bottom support frame through a crankshaft connecting rod; the end, penetrating through the bearing head pipe, ofthe support shaft is connected with the handle through the first folding mechanism; the bottom support frame is provided with a fixed clamping base groove for limiting the second folding mechanism when the scooter is in an opening state; the bearing head pipe sleeves the support shaft; the bottom end of the second folding mechanism is rotationally mounted on the bottom support frame; and the seatis mounted at the top end of the second folding mechanism. The scooter is simple in folding method, compact in structure and less in occupied space after folding and convenient to carry.