The invention discloses an automatic lead-acid storage battery box film coating method which includes the steps: firstly, automatically conveying a film by an automatic film conveying mechanism and clamping a film head by a film head clamping device after the film head passes a gap through the film; secondly, pushing a lead-acid storage battery box to a lead-acid storage battery box conveying line by a lead-acid storage battery box pushing mechanism, pulling the film along the direction of the lead-acid storage battery box conveying line in the pushing process of the lead-acid storage battery box, gradually wrapping the lead-acid storage battery box with the film through the gap between an upper film guide roller and a lower film guide roller, cutting off the film by a film cutter, and loosening the film head by the film head clamping device; finally, enabling the lead-acid storage battery box to completely pass the gap between the upper film guide roller and the lower film guide roller, wrapping the lead-acid storage battery box with the film, and conveying the lead-acid storage battery box on the lead-acid storage battery box conveying line to wait for heat sealing. The method is simple in process and low in cost.