The invention discloses a conveying device which comprises at least one tray, a first motor and a first conveying mechanism. The tray is arranged on the first conveying mechanism, the first motor is connected with the first conveying mechanism and used for driving the first conveying mechanism to move, the first conveying mechanism is used for moving the tray from one end of the first conveying mechanism to the other end of the first conveying mechanism, and a positioning assembly is arranged on the tray. According to the conveying device, the positions of workpieces on the tray are limited through the positioning assembly and fixed without changes every time, so that when the workpieces are grabbed by a grabbing mechanism every time, the same positions of the same workpieces can be accurately grabbed, the workpieces are placed in another machining area to be machined according to the same positions, when machining areas are switched, a worker does not need to adjust the positions of the workpieces any more, the workpieces can be directly machined in the machining areas, extra operation steps are reduced, and in this way, the production efficiency is improved.