The invention discloses a long hair quickly drying device which comprises a head cover, a connecting pipe, a hairdryer, a sliding bracket, a sliding curtain, a lower cover, a rack and a guide rail, wherein the head cover is provided with a hemispherical shape and a double-layer design; the inner layer is provided with dense small holes; the middle is hollowed out; the end face is closed and communicated with the lower cover; and the lower side is connected with the lower cover which is inclined outwardly. A low cover is arcuate, double-layer design, dense thin hole are arranged in that inner layer, the upper end of the middle hollow out is communicated with the head cover, the lower end is communicated with the sliding bracket, the outer layer is communicated with the connecting pipe, a plurality of rack bars are arranged in the arc direction of the inner side, guide rails are arranged on both sides of the vertical edge, and sliding brackets are arranged on the lower side, so as to slide on the lower cover. The connection pipe is set to be a telescopic hose suction hairdryer connection. A suction blow is provided with a suction and a blow button to control that suction and the blowof the suction blower. Set the sliding curtain to move up and down along the guide rail.