The invention discloses a full-automatic LED lamp pin cutting mechanism. The full-automatic LED lamp pin cutting mechanism comprises a base, a motor seat installed on the base, a clamping seat installed on the motor seat, a single clamp seat installed above the clamping seat and a cover board arranged above the single clamp seat. The motor seat is provided with a servo motor and a transmission component and the servo motor is connected with the transmission component. Multiple single clamp heads area arranged at the front end of the single clamp seat and multiple clamping grooves are formed in the lower side of the front end of the single clamp seat. A position clamping groove recessed inwards is formed in the upper side of the front end of the clamping seat in the length direction of the clamping seat, multiple sets of locating grooves are formed in the upper end of one inner side wall of the position clamping groove, and a cutter seat is arranged between the clamping seat and the single clamp seat. A cutter is arranged on the upper side of the front end of the cutter seat. By the adoption of the full-automatic LED lamp pin cutting mechanism, pressing is added before pin cutting, pin cutting stability is guaranteed, multiple LED lamp pins are cut at a time, production efficiency is improved, and the mechanism is more stable and reliable, simple in structure, high in accuracy and efficiency and good in market application value.