The invention relates to a protection method in an iron alloy smelting production system, and in particular to a submerged arc furnace body protection method. The submerged arc furnace body protectionmethod aims to stabilize an electrode and a displacement interval range through optimization of a corresponding data analysis trend and an operation process and corresponding technical improvement inproduction operation of an existing iron alloy submerged arc furnace. By means of constant-gear operation control and return slag addition, erosion of the furnace eye and the furnace wall is controlled within a certain range, the erosion amount is reduced, meanwhile, the furnace wall and the furnace eye are repaired, the bonding degree with furnace wall carbon bricks is achieved, and the self-repairing effect is achieved; and secondly, manual plugging operation is replaced, the situation that due to the fact that the mud plugging depth is too small, high temperature moves outwards, molten iron scours furnace eye openings in the inner side is reduced, in addition, input of low-pressure compensation is introduced, the structural proportion of furnace charge is changed, discharging of furnace slag in the tapping process is reduced, the furnace slag is fully subjected to a reduction reaction in the furnace, productivity is released, the service life of the submerged arc furnace is prolonged, and security risks are reduced.