The invention provides an automatic seal ring loading system for a lead-acid battery after cover closure. The automatic seal ring loading system comprises a conveying mechanism, a material pile arranged at an input end of the conveying mechanism, a feeding device located on the rear side of the material pile, a detection and correction device located on the rear side of the feeding device as wellas a seal ring loading device located on the rear side of the detection and correction device. Perpendicularity of a pole of the lead-acid battery is corrected by the detection and correction device,then the seal ring is loaded to the pole by the seal ring loading device, the seal ring is rotationally pressed by a pressing mechanism in a loading process, the technical problem of low seal ring loading precision for the pole of the lead-acid battery is solved, sealing performance of the seal ring is improved, seal ring loading speed is increased, and poor sealing effect caused by twist in the seal ring loading process is prevented.