The invention discloses a sliding rail lifting device. The sliding rail lifting device comprises a lifting component, two groups of sliding components, a driving component and a substrate, wherein the lifting component is formed by two mutually-parallel sliding rails, two connecting blocks, a connecting plate, two connecting shafts, two adjusting rods, a support, two supporting shafts, two rotating shafts and two supporting plates; the two groups of the sliding components are formed by guide rods, guide rod supports and bearings; the driving component is formed by a motor, a speed reducer, a screw rod and a screw rod support; the parallelled sliding rails in the lifting component are arranged on the support through the adjusting rods and the supporting plates; the guide rods of the two groups of the sliding components are parallel to each other, are vertical to the horizontal surface and are fixedly arranged on the substrate, and the bearings are fixedly connected with the support in the lifting component; a screw rod nut in the driving component is fixedly connected with the support in the lifting component; the lifting component is driven to do lifting motion by the driving component under the guide of the sliding components. The sliding rail lifting device disclosed by the invention has the advantages that a connection action of the sliding rails is omitted, human power is not needed, and a connection process is smoother; installation and adjustment are convenient due to the horizontal adjustment of the sliding rails, and the damage to the sliding rails and the occupied space are reduced.