The invention provides a waist plate transmission mechanism of a surgical bed. The waist plate transmission mechanism comprises a body, a driving shaft, gear and worm cases, a control handle, a mounting frame and a waist plate. The driving shaft is rotationally mounted on the body, the gear and worm cases are mounted on the body and are coupled with the driving shaft via gears, the control handle is connected to the gear and worm cases by universal joints and a connecting rod, the mounting frame is mounted on the body, the waist plate is fixedly mounted on the mounting frame, driving gears are fixedly mounted at two ends of the driving shaft, and racks are arranged on support legs of the mounting frame and are coupled with the driving gears. The waist plate transmission mechanism has the advantages that the waist plate transmission mechanism is simple in structure and convenient to use, power is transmitted to the mounting frame under the rocking-turn action of the control handle, torque is transmitted by the aid of the gear and worm cases, and accordingly a lifting function of the waist plate can be implemented by the aid of low force; an angle of a transmission shaft can be changed by the universal joints, so that a long-distance transmission effect can be realized, and the waist plate transmission mechanism is high in transmission efficiency and good in self-locking property.