The invention discloses a method for detecting the quality of a water curtain of an underground storehouse. The method for detecting the quality of the water curtain of the underground storehouse by adopting the transient electromagnetic method includes the steps of clearing away interference sources and obstacles of a detection section, laying out a measuring line, collecting on-site data, conducting post processing and analyzing of a detection result and conducting retest and verification by correcting water filling pressure or supplementing water curtain holes according to the result. According to the method for detecting the quality of the water curtain, the water curtain holes and water in a water curtain roadway serve as low-resistance bodies relative to other substances of the underground storehouse, the transient electromagnetic method is used for detection of the quality of the water curtain of the underground storehouse so as to obtain a better detection effect, the water containing conditions of cracks, joints and the like in water area rock masses can be detected before and after the water curtain is formed and before and after the water curtain holes are filled with water, before and after contrastive analysis is conducted additionally, and therefore the forming quality of the water curtain of the underground storehouse is judged visually and rapidly.