The invention relates to an electrode group pressure and acid absorption quantity measurement method for an absorptive glass mat (AGM) lead-acid storage battery. In the method, a stretch test machine is used as a test instrument, and the method is carried out according to the following steps of: a, tested electrode group weighing; b, test preparation; c, testing; and d, test data sorting. In the method, the stretch test machine is used and is matched with a test device for accurately simulating the stress of the electrode group during the groove entering, after the groove entering, in an oversaturation state and in a saturation state, the pressure values are calculated, simultaneously, the acid absorption quantity of the whole electrode group at the certain thickness and the certain pressure and the acid absorption quantity of a separation plate with the certain thickness inside the electrode group at the certain pressure can also be tested, the data has the conclusive significance onthe distinguishing and adoption of the separation plates in different specifications and different performance, the defect of storage battery quality fluctuation caused by external factor change is avoided, and the important significance is realized on the quantization detection of the production process and the improvement of the storage battery production quality.