The invention provides an automatic conveying mechanism for conveying a carbon rod. The automatic conveying mechanism is characterized in that a driving mechanism is fixed on a frame plate, a first output shaft of the driving mechanism penetrates through the frame plate, erection columns extend from one side of the frame plate, the planes where the axis of the first output shaft and the axes of the erection columns are located are horizontal, an erection plate is arranged between the two erection columns, the erection plate is fixedly connected with the frame plate, and clamping convex stripsare arranged on the erection plate; and a chain wheel is arranged and is fixed to the first output shaft in a sleeving mode, another chain wheel is rotatably arranged on the erection columns in a sleeving mode, a chain is clamped on the two chain wheels, the clamping convex strips are clamped in the chain, a plurality of material taking parts are arranged on the chain, a material taking cavity isfixed on one side of the chain, the material taking parts are suitable for taking out a tubular material in the material taking cavity, a material storage cavity is fixed on the other side of the chain, and the material taking parts are suitable for placing the polished tubular material. According to the automatic conveying mechanism, the effects of automatic material taking and automatic materialplacing can be realized conveniently.