The invention relates to a high-temperature corrosion preventing and coking preventing boiler body structure. Hedging combustors are correspondingly arranged on a front wall and a rear wall of a boiler hearth. The left wall and the right wall of the hearth are the same in structure and correspondingly protrude towards the outer side of the hearth so that scouring corrosion to a water cooling wallon the inner side wall of the hearth from high-temperature smoke can be weakened. The water cooling wall is closely attached to the inner wall of the left wall and the inner wall of the right wall, and is matched with the left wall and the right wall in shape. The high-temperature corrosion preventing and coking preventing boiler body structure has the beneficial effects that the left wall and theright wall of the high-temperature corrosion preventing and coking preventing boiler body structure protrude towards the outer side of the boiler, the distance between the middle portions of the leftwall and the right wall and the center of the boiler hearth is increased, during hedging combustion, high-temperature smoke scours the left wall and the right wall mainly from the middle positions ofthe front side wall and the rear side wall, and therefore after the above structure improvement, corrosion to the water cooling wall at the center positions of the left side wall and the right side wall from the high-temperature smoke is greatly relieved, hearth coking is avoided or relieved, and the actual using effect is very good; and the service life of the water cooling wall is greatly prolonged, the overhauling and water cooling wall replacement period is shortened, and safe and economic running of the boiler is guaranteed.