The invention discloses a fork trimming device with a full-automatic fork conveying system. The fork trimming device comprises a blanking machine, a fork input mechanism, a middle carrying mechanism and a fork output mechanism. The middle carrying mechanism comprises guide rails, two sliders, a cylinder and two manipulators, wherein the two sliders are slidably mounted on the guide rails, the cylinder drives the sliders, and the manipulators are fixed onto the two sliders respectively. The fork input mechanism and the fork output mechanism are positioned at two ends of the middle carrying mechanism. By the aid of the technical scheme, the fork input mechanism conveys forks to be machined to the middle carrying mechanism one by one in a stepping mode, the middle carrying mechanism carries the forks in the machining process by means of two moving modules and the two manipulators, and the fork output mechanism carries the machined forks outwards from the middle carrying mechanism one by one in the stepping mode. Therefore, the forks are automatically inputted, carried and outputted, and fork trimming efficiency can be improved.