The invention provides a mechanical lifting mechanism. The mechanical lifting mechanism comprises a driving mechanism, a fixing drum, a rotatable center screw rod, at least two layers of lifting drums and a cargo carrying platform, wherein the rotatable center screw rod is located at the central axis of the fixing drum, the two layers of lifting drums are arranged between the center screw rod and the fixing drum in a coaxially sleeved-folded mode, and the cargo carrying platform is located on the tops of the lifting drums in the innermost layer. The driving mechanism can drive the center screw rod to rotate. In the lifting drums, at least one lifting drum is a driving lifting drum, and the other lifting drums are driven lifting drums. The driving lifting drum is in rigid connection with a screw rod nut matched with the center screw rod. Traction mechanisms are connected between the driven lifting drums and the driving lifting drum as well as between the other adjacent driven lifting drums. When the center screw rod is driven to rotate by the driving mechanism, then the driving lifting drum does linear motion in the axis direction, and the driven lifting drums are driven to do linear motion in the same direction through the traction mechanisms. The mechanical lifting mechanism has the advantages of being compact in structure, long in lifting journey, high in lifting speed and the like.