The invention provides a grid rudder transmission mechanism for aerospace vehicles, which includes a support column, a wall plate, an actuator, a main shaft, a rocker, a spacer, a large lock nut, a small lock nut, an end cover, a pin Cover, two special pins, adjusting spacers, double row full complement roller bearings, two tapered roller angular contact bearings. One end of the supporting column is connected with the wall plate, and the other end is connected with the end cover. Double-row full complement roller bearings, large lock nuts, rockers, spacers, two tapered roller angular contact bearings, and small lock nuts are installed in series in series on the spindle axis. The main shaft can rotate freely under the common support of three bearings. The keyway on the rocker mates with the keyway on the spindle. The fixed rod of the actuator is connected with the wall plate through a special pin, and the actuating rod is connected with the rocker through a special pin. The actuating rod of the actuator stretches axially to drive the rocker, which in turn drives the main shaft to rotate.