The invention discloses a forming method for realizing high-temperature bulging self material supplement through changing friction coefficient. The forming method comprises the following steps that 1,the labeling sequence is analyzed, and the surface roughness of each area of an aluminum alloy special-shaped thin-wall superplastic forming barrel mold is determined; 2, a lubricant proportioning isselected; 3, the lubricant injection speed is selected; 4, lubricant spraying is carried out on the aluminum alloy special-shaped thin-wall superplastic forming barrel body mold; 5, lubricant spraying is carried out on an aluminum alloy special-shaped thin-wall superplastic forming barrel body blank; and 6, superplastic forming is carried out to form an aluminum alloy special-shaped thin-wall superplastic forming barrel body. According to the forming method, methods such as changing the surface roughness of the aluminum alloy special-shaped thin-wall superplastic forming barrel body mold, spraying the lubricant on the aluminum alloy special-shaped thin-wall superplastic forming barrel body mold and spraying the lubricant on the aluminum alloy special-shaped thin-wall superplastic formingcylinder body are adopted, so that the friction coefficient between the aluminum alloy special-shaped thin-wall superplastic forming barrel body and the aluminum alloy special-shaped thin-wall superplastic forming barrel body mold is changed, high-temperature bulging self material supplement of the aluminum alloy special-shaped thin-wall superplastic forming barrel body is realized, and size precision, molded surface precision and the surface quality requirements of the aluminum alloy special-shaped thin-wall superplastic forming barrel body are guaranteed.