Mechanism for improving stability of lifting mechanism of printing machine

The invention discloses a mechanism for improving the stability of a lifting mechanism of a printing machine. The mechanism comprises a side plate and a mounting table, four connecting columns are arranged at the four corners of the bottom of the mounting table correspondingly, the bottom ends of the connecting columns are jointly connected with a bottom plate, transmission mechanisms are arranged at the four corners of the bottom plate correspondingly, L-shaped mounting plates are arranged at the four corners of the bottom of the bottom plate correspondingly, the transmission mechanism comprises lead screws rotationally arranged between the bottom plate and the L-shaped mounting plates, a synchronizing wheel located between the bottom plate and the L-shaped mounting plate is arranged on each lead screw, a flange fixed to the bottom of the lead screw is arranged at the upper end of the synchronizing wheel, a lifting sleeve is connected to the lead screw in a threaded mode, a jacking column is arranged at the