To provide a method for producing a carbon fiber bundle which can improve strength of the carbon fiber bundle, prevent dust during processing, improve heat resistance and fire resistance, prevent peeling of coating, and improve surface appearance. The carbon fiber bundle is obtained by a heat treatment step of welding at least one of carbon fibers that constitute the carbon fiber bundle with another fiber using a nylon resin, a copper plating step of plating with a copper coating, a nickel plating step of plating with a nickel coating, and an acrylic resin impregnation step.