The utility model relates to a quick changing device for wheel parts of a crane. The quick changing device comprises a connecting plate (1), connecting bolts (2), overturning prevention auxiliary wheel guide arms (3), auxiliary wheels (4) and a bearing (5), wherein wheels (6) are arranged on a track in pairs; each pair of wheels (6) are mounted and fixed on the bottom surface of a large vehicle frame by a fixed frame (7); a pair of overturning prevention auxiliary wheel guide arms (3) are respectively mounted on the inner and the outer side surfaces of the fixed frame (7); the auxiliary wheels (4) are mounted at the lower ends of the overturning prevention auxiliary wheel guide arms (3). According to the quick changing device, the changing speed of wheels can be greatly reduced.