The invention relates to the field of inhibiters, and discloses an acid adding inhibiter and a method for acid pickling through the acid adding inhibiter. The acid adding inhibiter comprises quaternary ammonium compounds, thiourea, aluminum phosphate and/or aluminum dihydrogen phosphate and phytic acid and/or tannic acid. The acid adding inhibiter can be used in special steel such as automobile structural steel, is small in use amount and has excellent corrosion inhibition performance. Automobile structural steel hot-rolled acid pickling plates with good surface quality can be obtained. Besides, operation cost is low, and economic benefits are good.