The invention provides a combined transport trolley and a transport method of the combined transport trolley. The combined transport trolley comprises a plurality of parallel transverse tracks and at least one longitudinal track, wherein the positions of the transverse tracks are higher than the positions of the longitudinal tracks, the longitudinal tracks are arranged at the ends of the transverse tracks, an upper trolley is cooperatively arranged on the transverse tracks, a lower trolley is cooperatively arranged on the longitudinal tracks, a transverse lower trolley guide rail is arranged at the top of the lower trolley, the lower trolley guide rail and the transverse tracks are arranged at the same horizontal plane, and the lower trolley guide rail is matched with the transverse tracks. The transport method of the combined transport trolley comprises the following steps that: (1) the upper trolley is arranged on one of the transverse tracks, goods are placed on the upper trolley, and the upper trolley moves onto the lower trolley guide rail of the lower trolley along the transverse tracks; (2) the lower trolley drives the upper trolley to move along the longitudinal tracks to one ends of the transverse tracks required by the goods; and (3) the upper trolley moves to an objective position along the transverse tracks required by the goods.