A foam gelling acid, and preparation, a using method and applications thereof

The invention relates to a foam gelling acid. The foam gelling acid comprises 0.5-2.0% by weight of an ampholytic surfactant, 10-25% by weight of hydrochloric acid, 0.1-0.7% by weight of polymer, 1-2% by weight of a corrosion inhibitor, 0.02-0.05% by weight of a gel breaker and water, with the total foam gelling acid being 100% by weight. The invention also relates to a preparing method and a using method of the foam gelling acid.