The application discloses a conveying device, which comprises a shell, a first conveying structure, a second conveying structure and a third conveying structure, the first conveying structure is arranged in the shell, the second conveying structure is arranged in the shell and is located below the first conveying structure, the first conveying structure can be conveyed along an X direction and can be moved along a Z direction, the first conveying structure can pass through the second conveying structure during descending along the Z direction, so that the conveying surface of the first conveying structure is lower than the conveying surface of the second conveying structure, the conveying surface of the third conveying structure is exposed outside the shell and is located in the same plane as the conveying surface of the second conveying structure, and the second conveying structure and the third conveying structure can be conveyed along a Y direction. The height of the conveying surface of the second conveying structure and the height of the conveying surface of the third conveying structure are the heights for facilitating manual taking of the material pieces. When sampling inspection is needed, the material pieces can be directly taken out from the third conveying structure by manual operation for sampling inspection, so that the sampling inspection efficiency can be effectively improved.