Die applicable to deflection of small and long cantilever

The invention relates to the technical field of die processing, in particular to a die applicable to the deflection of a small and long cantilever. The die comprises an upper die body and a lower diebody which are mutually connected, wherein a tongue core is arranged at the middle of the upper die body along the direction from the feeding end to the discharging end of the upper die body, and extends out of the discharging end of the upper die body so as to form a bulge; a first working belt is arranged on the bulge; four flow distributing holes which penetrate through the upper die body are formed in the circumferential surface of the feeding end of the upper die body and uniformly distributed around the tongue core; flow distributing bridges are arranged among the flow distributing holes; and a welding chamber, a second working belt, a lower die clearance groove and a discharging port are sequentially arranged on the lower die body along the direction from the feeding end to the discharging end of the lower