The utility model provides an automatic hair clamping and curling device which comprises a holding portion and a heat conductive pipe, wherein the heat conductive pipe is connected with the holding portion. The heat conductive pipe comprises a lower heat conductive pipe body and an upper heat conductive pipe body. The inside of the heat conductive pipe is provided with a heating assembly, the tail portion of the lower heat conductive pipe body is fixedly connected with the holding portion, the tail portion of the upper heat conductive pipe body is connected with the tail portion of the lower heat conductive pipe body in a hinged mode, the heat conductive pipe is provided with an elastic piece for driving the upper heat conductive pipe body and the lower heat conductive pipe body to tightly clamp hair, and a guide groove is formed between the front end of the upper heat conductive pipe body and the front end of the lower heat conductive pipe body. Due to the fact that the elastic piece is arranged between the heat conductive pipe and the inner wall of the holding portion, hair can be fixed between the upper heat conductive pipe body and the lower heat conductive pipe body with proper force, meanwhile, due to design of the guide groove, hair can be conveniently and directly placed into the heat conductive pipe, a hair straightening effect or a hair curling effect can be achieved, and hair curling or hair straightening can be achieved without manually operating a hair straightening device or a hair curling device.