1. A display panel motherboard, comprising: a first motherboard and a second motherboard which are cell-assembled with each other, wherein, the first motherboard includes a plurality of first substrate units, the second motherboard includes a plurality of second substrate units, and the first substrate units correspond to the second substrate units in one-to-one correspondence;a first sealant is provided on the first motherboard and the second motherboard in a first packaging region of, and the first packaging region is a region surrounding the plurality of first substrate units and the plurality of second substrate units;
a second sealant is provided on the first substrate unit and the second substrate unit in a second packaging region;
wherein, the first sealant is a sealant comprising a main adhesive material and a water swellable material dispersed and doped in the main adhesive material,
wherein, a value of a water swelling rate of the water swellable material ranges from 110% to 200%.