Flat cutting device for petroleum pipeline

The invention discloses a flat cutting device for a petroleum pipeline. The device comprises a base, a first fixing block and first fixing seats, wherein the first fixing seats are mounted at four corners of the top part of the base; first rotating shafts are mounted in inner chambers of the first fixing seats; the outer sidewalls of the first rotating shafts are sleeved with first rotating wheels; four groups of second fixing seat are mounted on the top part of the base; second rotating shafts are mounted in inner chambers of the second fixing seats; and gear sets sleeve the outer sidewalls of the second rotating shafts. According to the device, a motor is used for driving the first rotating wheels to rotate to supply primary power, and second rotating wheels at the bottom parts of limiting plates are coordinately rotated, so that the petroleum pipeline in contact with the first rotating wheels and the second rotating wheels are rotated; a cutting mechanism is moved to cut through a lifting device, thus the