The invention belongs to the field of storage batteries and discloses a storage battery grid ageing performance detection method. The method comprises the following steps that: N large grids are randomly sampled, the N large grids are randomly sheared, so that small grids can be obtained; the pre-detection length of one diagonal line of each of the N small grids is measured; the N small grids aresuspended with the diagonal lines kept vertically, and weights of preset weight are hung at the bottoms of the diagonal lines; the weights are taken off after having been suspended for preset time, the post-detection length of the diagonal line of each of the N small grids is measured, and N post-detection lengths are altogether obtained; if the average number of the range difference values calculated on the basis of the N pre-detection lengths and the N post-detection lengths is smaller than a reference value, the ageing strength of the grids meets process requirements, otherwise, the ageingstrength of the grids fail to meet the process requirement. Compared with the prior art, the detection method disclosed by the invention is simple, convenient, and accurate, satisfies aging hardeningtechnological requirements, benefits coating, and can assist in avoiding quality problems such as deformation and grid sticking and improving the slitting pass percent of polar plates.