The invention discloses a novel continuous tube outer surface 2PE anti-corrosion production line. The novel continuous tube outer surface 2PE anti-corrosion production line comprises an uncoiling straightening machine, a flame burning heating furnace, a shot-blasting derusting machine, a medium-frequency heating furnace I, an acid-pickling phosphating room, a high-pressure cleaning and air-dryingroom, a medium-frequency heating furnace II, an adhesive and polyethylene round-mould negative-phase coating forming deice, a spraying water-cooling room, a ring-shaped electric spark leakage-detecting device, a tube end turning device and a coiling machine, which are sequentially arranged. The invention further discloses a novel continuous tube outer surface 2PE anti-corrosion process which effectively solves the problems that an epoxy layer in a 3PE anti-corrosion coating is liable to crack and disable in a continuous tube bending process, and the like; moreover, a tube body surface is completely cleared through shot-blasting derusting, preheating and acid-pickling phosphating, so that cleanliness of the continuous tube surface which is subjected to anti-corrosion treatment is guaranteed; and a tube body temperature, an adhesive membrane temperature and a polyethylene membrane temperature are kept to be consistent, so that an anti-corrosion layer on a tube wall is in tight fit to thetube wall, and therefore, durability of the anti-corrosion layer is strengthened.