The utility model discloses a large -scale chemical industry equipment prevent etching unit, including the equipment body, there is etched surface on the equipment body, still include an anti -corrosion coating, corrosion resistant plate, the 2nd anti -corrosion coating and bolt, an anti -corrosion coating simultaneously hugs closely the equipment body and covers etched surface totally, the another side be provided with with the same corrosion resistant plate of anti -corrosion coating size, corrosion resistant plate is last to have the bolt, and the bolt passes an anti -corrosion coating and gets into the fastening of equipment body, makes corrosion resistant plate press on an anti -corrosion coating, the 2nd anti -corrosion coating lies in the corrosion resistant plate outside and complete whole anti -corrosion coating of cladding and corrosion resistant plate, the 2nd anti -corrosion coating and corrosion resistant plate, and an anti -corrosion coating, and all adopt resin clay bonding with all contact surfaces between the equipment body. The utility model is simple in operation, it is with low costs, durable lastingly.