The invention discloses a metamaterial motion-sensing holographic element and a design method thereof. The motion-sensing holographic element comprises a substrate, and periodically distributed silicon nano brick array units are etched on the work face of the substrate. The sizes of silicon nano bricks in the silicon nano brick array units are equal, the orientation angle phi(x,y) of the silicon nano bricks is theta(x,y)/2, theta(x,y) is the phase of corresponding pixels (x,y) of the silicon nano bricks, and center gaps between adjacent silicon nano bricks in the x direction and the y direction are equal. By means of the element and the design method, continuous phase modulation can be achieved on incident light. The process is simple, and the element has the outstanding advantages of being excellent in performance, high in stability, good in reliability, easy to manufacture and the like.