The invention discloses a galvanized steel sheet trimming circle shear and belongs to the technical field of circle shears, the galvanized steel sheet trimming circle shear comprises a bottom plate, the upper surface of the bottom plate is fixedly connected with the lower surface of a circle shear body, the left side and the right side of the inner wall of the circle shear body are each provided with an upper cutter head and a lower cutter head, and the upper surface of the bottom plate is fixedly connected with the lower surfaces of two baffles; the opposite faces of the two baffles are each provided with two transmission rollers. According to the galvanized steel sheet trimming circle shear, by arranging the material box, the rotating disc, the storage box, the upper cutter disc, the spring, the clamping rod, the clamping groove, the fixing plate, the connecting base, an oil leakage hole, a discharging pipe and a protective cover, the clamping groove is effectively clamped into the corresponding clamping groove, the fixing plate is effectively limited, and compared with a traditional mode that the cutter disc is cleaned or lubricated regularly, the cutting efficiency is improved; according to the scheme, the upper cutter head is effectively lubricated in time, the oil dripping amount can be adjusted according to the machining state of the circle shear, the machining precision is improved while the service life of the circle shear is guaranteed, and efficient and stable work of the circle shear is facilitated.