The invention discloses a distribution-drilling method for a floating screen frame of a banana-shaped flip-flow screen. The method comprises the following steps: a, manufacturing a side square drill template; b, manufacturing an upper drill template; c, manufacturing a lower drill template; d, assembling a distribution-drilling part assembly; e, using a numerical-control drilling machine and a boring machine to drill upper support angle steel, lower support angle steel and the floating screen frame; and f, dismounting the distribution-drilling part assembly, accomplishing distribution-drillingof the floating screen frame once, and utilizing the side square drill template, the upper drill template, the lower drill template, a support block and an auxiliary cushion plate to perform distribution-drilling on next floating screen frame. The distribution-drilling part assembly consisting of the side square drill template, the upper drill template, the lower drill template, the auxiliary cushion plate and the support block, which can be used in a circulating mode, is adopted to perform all-around distribution-drilling on the upper support angle steel, the lower support angle steel and the floating screen frame, so that drilling difficulty is greatly reduced, drilling precision of the floating screen frame is improved, and smooth production is guaranteed.