The present invention relates to a method for setting and judging break beads for parts by draw forming. The method comprises the following steps: firstly, determining two sections of which the section difference is larger and the spacing between the sections is L; secondly, determining the section arc lengths between two profiled outlines are L1 and L2 and plan ranges between the two profiled outlines are a1 and a2; thirdly, calculating unilateral inflow volume of section materials: b1=(L1-1.06a1)/2,b2=(L2-1.06a2)/2, wherein 1.06 is the plastic deformation ratio of the section materials; fourthly, working out theta, according to a formula; and fifthly, setting a single reinforcement if the theta is less than 7 DEG, setting a double reinforcement if the theta is more than or equal to 7 DEG and less than or equal to 15 DEG, and providing design alteration of a product if the theta is more than 15 DEG. The method has simple mathematical calculation, less steps and amount of calculation, and fast and accurate determination; and the determination does not exceed ten minutes.