The utility model belongs to the technical field of superhard cutter and specifically relates to a strong fix chip -breaker superhard insert, including 80 corner rhombus cutter blade bodies, the cutting edge department of blade body is provided with the chip -breaker, and the chip -breaker is the V font on the blade body, and the contained angle of V font chip -breaker is greater than the apex angle of blade body main cutting edge department, and the center department of blade body is provided with the fixed slot. Compared with the prior art, the utility model discloses under certain condition in the aspect of the effect of realization, can exert excellent chip -breaking performance, improve cutter life and production efficiency, improve the processing environment, protection workpiece surface quality improves workpiece surface smooth finish, set up the fixed slot on the blade body, prevent on the one hand the blade when the atress is uneven from the cutter arbor the departure, on the other hand can prevent also that the blade from turning over to give birth to to deflect, improves the surface machining quality of work piece, to operating personnel's safety in production, also play an active role.