The invention relates to a gear transmission-based display double-layer lifting support. It consists of a base, a vertical column, a lifting platform, a lifting device, a positioning device, and lighting fixtures; the vertical column includes a left and a right column, which are fixed on a horizontal base by screws, and the left and right columns are all cube-shaped and hollow structure, its front and rear surfaces are designed with concave grooves; the lifting platform includes a display platform, a cube keyboard platform, a mouse pad, and double U-shaped support arms; the lifting device includes a pair of racks, wheels, rotating shafts, A pair of handwheels and a pair of rollers; the positioning device includes a box body, a spring, a tooth block, a handle, and a concave protrusion; the beneficial effect of the present invention is that the height of the display and the keyboard can be raised by adjusting the handwheel; It solves the problem that desktop computer users are tired from sitting, have pain in the buttocks, can use the monitor and use the keyboard and mouse synchronously while standing, and can also reduce the probability of suffering from cervical spondylosis.