The invention relates to a method for forming a special-shaped braided fabric, which comprises the following steps of: firstly, arranging each braiding yarn forming the special-shaped braided fabric in a shape similar to the braided body on a braiding machine according to the shape of the cross section of the braided fabric to be braided, wherein all the braiding yarns are arranged in the rule of a staggered dot matrix along longitudinal and transverse directions in the arrangement; shifting the braided yarns on the same transverse row or the same longitudinal line one by one by using the operation procedure of four steps of upper, lower, left and right in one cycle in subsequent braiding so as to complete one braiding cycle in this way. Therefore, the adjacent relationship between each braiding yard and surrounding braiding yarns in the special-shaped braided fabric always remains the same, and each braiding yard is only twisted with adjacent braiding yarns.