Lifting device for lifting positioner

The utility model discloses a lifting device, in particular a lifting device for a lifting positioner. The lifting device comprises a driving system (1), a lifting screw (2), a linear guide rail (3), a nut pair (4) and a slide seat (5), wherein the driving system (1) is connected with the nut pair (4) through the lifting screw (2); the slide seat (5) is fixed on the linear guide rail (3); and the side face of the slide seat (5) is hung and fastened to the nut pair (4) on two sides of the lifting device. The lifting device is characterized in that: a section of buffer area (6) extends from the lower part of the slide seat (5) hung and fastened to the nut pair (4); the nut pair (4) is provided with a proximity switch (7); and the proximity switch (7) and the driving system (1) are connected with the same control system. The lifting device has the advantages that: the section of buffer area is arranged between the nut pair and the slide seat, so that opposite force cannot be generated for the nut pair when a wor