The invention discloses a device used for trimming and processing a car anti-collision beam. The device comprises a rack, wherein a transfer mechanism, a turnover pressing mechanism and a trimming mechanism are arranged on the rack; the trimming mechanism is equipped with two groups of trimming oil cylinders for separately trimming the two ends of a product part; a trimming working position is arranged between each group of two trimming oil cylinders which are symmetrically arranged; the turnover pressing mechanism is symmetrically equipped with two sets of turnover pressing oil cylinders; the two ends of the product part are separately pressed by each set of turnover pressing oil cylinders; and under co-action of an electric cylinder, a supporting oil cylinder and a rotary air cylinder, the transfer mechanism is used for transferring the product part to the trimming working position or moving the product part out of the trimming working position. The device can realize operations such as automatic feeding, product part pressing and primary trimming for end heads at two sides, and the operation process does not need manual intervention, so that production efficiency is improved and manual production cost is reduced. The device independently operates, is integrated between a front process and a rear process, and is conveniently linked with the front process and the rear process automatically.