The invention relates to a dynamic load transfer device of a self-elevating drilling ship leg locking device and is characterized in that a cylinder body of a load transfer oil cylinder is fixed below a level frame of a platform bearing beam; a nut driven by a driving device is fixed below the level frame of a platform bearing beam through the shell thereof; the nut is matched with the internal and external screw threads in a screw rod which is a hollow tube shape; a top rod of the oil cylinder passes through the center of the screw rod, the upper end and a piston rod are one body, and the lower end and the lower end of the screw rod are supported together on an upper plane of a locking tooth-shaped block. The dynamic load transfer device has the advantages and effects of realizing dynamic load transfer, avoiding the vibration and impact of platform when transferring load, protecting racks on the spud leg and preventing the locking device from being clamped and not unlocked.