The invention relates to the field of manufacturing of storage batteries, and aims to provide a glue injection device and a glue injection method for a lead-acid storage battery. The glue injection device for the lead-acid storage battery comprises a glue storage cabin, a glue pressure pump and a return glue collecting groove, wherein the inlet of the glue pressure pump is communicated with the glue storage cabin; the glue injection device for the lead-acid storage battery further comprises a plurality of glue injection assemblies and quantitative glue storage assemblies; the glue injection assemblies and the quantitative glue storage assemblies are same in number and in one-to-one correspondence; the glue injection assemblies comprise a lead-acid storage battery, a return glue pipe, a glue injection tank, a glue injection on-off valve and a glue injection pipe, wherein the lead-acid storage battery is provided with a glue injection inlet positioned at the lower end or/and at the lower part of a side body and a return glue outlet positioned at the upper end; one end of the return glue pipe is detachably connected with the return glue outlet; the other end of the return glue pipe is communicated with the return glue collecting groove; the glue injection tank is positioned over the lead-acid storage battery, and provided with a positive and negative pressure ventilation reversing valve; the glue injection on-off valve is positioned at the lower end of the glue injection tank; one end of the glue injection pipe is communicated with the outlet of the glue injection on-off valve; and the other end of the glue injection pipe is detachably connected with the glue injection inlet. By means of the glue injection device for the lead-acid storage battery, the performance of the lead-acid storage battery can be further improved; and the service life of the lead-acid storage battery can be prolonged.