Abstract: An improvement of display elevating device comprising one supporting portion, a retraction portion and a base, wherein, the supporting portion contains a front panel and a spherical pivot head for fixing a display, wherein the front panel is provided with a spherical clamp for fixing the spherical pivot head, wherein the retraction device consists of a pillar connecting upwards to the supporting portion and a sleeve connecting downwards to the base, said pillar is fixed with a pneumatic cylinder, wherein an axial valve of the pneumatic cylinder is inserted into the base, and the sleeve is provided with an inner groove and a block connecting to the pillar, a key is provided on the base, used for the control of a transmission part to the axial valve of the pneumatic cylinder.