The invention relates to a conveying device, in particular to a workpiece machining conveying device. The workpiece machining conveying device comprises a conveying unit, two opposite vertical plates and a jig, wherein the vertical plates are clamped to the two side faces of the conveying unit, and the jig is arranged at the tail end of the conveying unit. The conveying unit comprises a first conveying part at the front portion, a second conveying part in the middle and a third conveying part at the rear portion. The first conveying part, the second conveying part in the middle and the third conveying part at the rear portion each comprise a left screw and a right screw which are arranged side by side, the left screw of the first conveying part, the left screw of the second conveying part and the left screw of the third conveying part are connected with one another, and the right screw of the first conveying part, the right screw of the second conveying part and the right screw of the third conveying part are connected with one another. According to the workpiece machining conveying device, the machining speed of the conveying unit and the machining speed of workpieces can be coordinated, workpieces are prevented from being jammed or not conveyed in time, the positions of workpieces conveyed out can be conveniently adjusted, and a detection step carried out before machining can be facilitated by adjusting the conveying unit.