The invention discloses a portable electric vehicle with a rapidly-foldable handlebar and a sleeved-connection connecting piece. The portable electric vehicle comprises the rapidly-foldable handlebar, a front fork, a front frame, a middle beam, the sleeved-connection connecting piece, a pedal, pulling wheels, a back fork piece, a saddle, a front wheel, a back wheel and an electric driving system. The rapidly-foldable handlebar is formed by a left handlebar body, a right handlebar body, an upper locking connecting piece, a left locking connecting piece, a right locking connecting piece, a foldable base piece and two handlebar positioning pieces, the foldable base piece is connected with the front fork and the front frame, the middle beam is connected with the front frame, the sleeved-connection connecting piece and the pulling wheels, a battery and a controller are arranged in the middle beam, and the sleeved-connection connecting piece is connected with the saddle; the saddle comprises a saddle tube, a locked connecting piece, a connecting rod, a saddle body and a foldable positioning lock, a sleeve connecting piece is connected with the back fork piece, the front wheel is connected to the front fork, and the back wheel is connected to the back fork piece; the electric driving system comprises a motor, the batter, the controller and a control switch, and the motor is arranged on the back wheel.