The invention relates to a thickness-adjustable large-size wandering star wheel comprising at least one unit wheel. The diameter of the unit wheel is larger than one half of the diameter of a polisherand is smaller than the diameter of the polisher. The center of the unit wheel is provided with a transmission hole. The transmission hole is matched with a center gear of the polisher. A grinding hole is further formed in the unit wheel. At least one of the upper surface or the lower surface of the unit wheel is provided with continuous concave parts and convex parts which are distributed on thewhole surface of the unit wheel. The concave parts and the convex parts are matched in shape. The range of the height difference of the concave parts and the convex parts is 0.2-0.5 cm. The wanderingstar wheel can be suitable for grinding work of different-thickness optical devices and is low in machining difficulty.