The invention provides a special-shaped sanding
machine. The sanding
machine comprises a
portal frame, a whole height adjusting frame which is arranged on the
portal frame and can vertically move and a
grinding device arranged on the top of the whole height adjusting frame; the
grinding device comprises a first
grinding mechanism, a second grinding mechanism, a third grinding mechanism and a fourth grinding mechanism, wherein the third grinding mechanism and the fourth grinding mechanism are the same in structure; and according to the
machine, the height of equipment can be adjusted according to different sample plates, use university of the equipment is improved, the grinding
height difference is large, and the maximum
height difference can reach 3 cm. Priming paint and substrates can be ground at the same time, and
abrasive paper does not need to be replaced. Meanwhile, design is achieved on the basis of the
human engineering principle, multi-direction grinding is achieved, and finally dead-zone-free grinding is achieved.