The reversible electric cage carrier of the drainage pipe roll welding machine produced by our company has been widely used by users at home and abroad because of its convenience, labor intensity reduction and other advantages. However, the problem of unloading the welded reinforcement cage to the ground has not been solved yet. It still needs to be unloaded with the help of human operation or lifting equipment (for large reinforcement cage). The labor intensity is very high when unloading the cage manually, and there is a certain degree of danger. The reversible electric cage of the drainage pipe roller welding machine developed by us can lower the reinforcement cage and automatically roll to the ground, greatly reducing the labor intensity of workers, and it is efficient, and will not damage the reinforcement cage.