Automatic lifting system

The invention discloses an automatic lifting system. The automatic lifting system comprises a control device, a driving device and a lifting device which are electrically connected together, wherein the driving device and the lifting device are controlled by the control device; the lifting device is connected with an external work table; the control device drives the driving device, so that the lifting device drives the external work table to make straight reciprocating motion; the lifting device comprises a first retaining plate, a second retaining plate, a movable plate, a lead screw, a lead screw nut and a supporting column; the movable plate is arranged between the first retaining plate and the second retaining plate; the driving device is fixed to the first retaining plate; the lead screw nut is inserted into and fixed on the movable plate; one end of the lead screw passes through the first retaining plate and is connected with the driving device, while the other end passes through the lead screw nut and then is connected with the second retaining plate; and one end of each supporting column is fixed to the movable plate, while the other end passes through the second retaining plate and protrudes on the second retaining plate to be connected with the external work table. The system has the advantages of high movement accuracy, high reliability, low noise, low pollution and simple structure.