High-stability supporting device for computer screen

The utility model discloses a computer screen supporting device with high stability, which comprises a connecting box, a transverse plate is arranged above the connecting box, and a display screen is arranged above the transverse plate. The rotary knob is rotated forwards to drive the rectangular rod to move through the screw rod to extrude the connecting rod, the connecting rod drives the transverse rod to move through the vertical block, the transverse rod drives the vertical rod to move through the L-shaped plate, the vertical rod drives the piston to exhaust gas in the round pipe, the suction cup makes contact with the table top, the rotary knob is rotated reversely, and the piston is driven to move through the vertical rod through the elastic force of the spring. A piston sucks gas in a round pipe to generate negative pressure, so that a connecting box can be stably placed on a table top, a second electric telescopic rod is started to drive a clamping plate to fix a display screen, the connecting box can