The invention discloses a prestressed tube tensioning mold, which comprises an upper mold and a lower mold. The upper mold and the lower mold are mutually fastened; and an inner mold is also arranged inside a mold formed by the upper mold and the lower mold. A tensioning mechanism is arranged at one end of the mold, and a tensioning fixed plate is arranged at the other end of the mold. The prestressed tube tensioning mold is characterized in that: the tensioning mechanism comprises a tensioning screw rod connected with a tensioning draw plate; the tensioning draw plate is connected with a tensioning connecting plate through a tensioning connecting piece; and the tensioning connecting plate is connected with concrete centrifugal products. The prestressed tube tensioning mold can effectively reduce the labor intensity, effectively suppress slurry leakage of a pile head, prolongs the service life of the screw rod and die assembly screws, guarantees the verticality of the screw rod and the section of the concrete centrifugal products, prevents the screw rod from inclining, reduces the die clamping probability and whole prestress non-uniformity of the pile, avoids steel mould damage and fittings damage during mold removal, avoids the damage of the concrete centrifugal products simultaneously, and improves the working efficiency.