The invention relates to umbrellas, and discloses a fully-automatic opening and closing umbrella. The fully-automatic opening and closing umbrella comprises a middle stick group, an upper nest and a lower nest, wherein the middle stick group comprises an outer tube, a middle tube and an inner tube, and further comprises a screw transmission device and a line transmission device; the screw transmission device comprises a connecting tube, a ball screw, a ball sliding nut and a fixed ball sleeve; the ball sliding nut is connected with the middle tube through the connecting tube; the line transmission device comprises a first control line, a second control line and a third control line with one ends being all fixedly connected with the fixed ball sleeve; the other end of the first control line bypasses the ball sliding nut, penetrates through a pulley seat of the middle tube, and then is fixed on a pulley seat of the outer tube; the other end of the second control line firstly bypasses the pulley seat of the outer tube and the lower nest, and then is fixed on the upper nest; the other end of the third control line bypasses the pulley seat of the middle tube, and then is fixedly connected with the outer tube. The fully-automatic opening and closing umbrella realizes the retraction of sleeves of all sections of the middle stick group through cooperation of the first control line, the ball screw and the ball sliding nut, completely realizes the function of fully automatic opening and closing, and is fast in opening and closing.