The invention discloses an automatic pin bending and shearing device for an optical assembly. The automatic pin bending and shearing device comprises a bending and shearing table and the optical assembly, wherein the optical assembly is composed of an optical assembly upper end portion and a pin, four first supporting columns are symmetrically and fixedly connected to the upper surface of the bending and shearing table, and the sides, close to one another, of the four first supporting columns are jointly and fixedly connected with a fixing seat; a containing groove is formed in the fixing seat, a round blind hole is formed in the lower surface of the fixing seat, and moreover, the upper end of the round blind hole communicates with the containing groove; the optical assembly upper end portion is located in the containing groove, moreover, the pin penetrates through the round blind hole and extends to the position below the fixing seat, four fixing structures are symmetrically arrangedon the fixing seat, and the lower surface of the fixing seat is fixedly connected with two second electric push rods. According to the automatic pin bending and shearing device, the bending and shearing precision is high, the bending amplitude and the pin shearing length can be accurately controlled, the optical assembly is fixed during bending and shearing, so that the bending and shearing precision of the optical assembly is improved.