The invention relates to an automatic encapsulating and matching machine of a lead-acid storage battery plate, in particular to a device for encapsulating and matching a small-density polar plate in a production procedure of the lead-acid storage battery automatically. The encapsulating and matching machine of the lead-acid storage battery plate is an assembly line device comprising a rack, a paper feeding device, a plate feeding device, a paper cutting device, a polar plate feeding device and a collecting device which are sequentially connected, and the assembly line device automatically cooperates under the action of an electrical control system. By adopting a dual-line paper feeding device and the polar plate feeding device which are serially connected, and the plate feeding device vertically connected with the polar plate feeding device, the encapsulating and matching machine has the advantages of being simple, convenient and reasonable in structure, lowering the device failure rate and polar plate turnover times, realizing automatic encapsulation and matching of lead alloy polar plates of an automobile, completing the transformation of low-efficiency work to automatic, high-efficiency and environmental-friendly operation of the production process, greatly lowering the production strength and operation cost of manual operation, increasing the labor production efficiency, and reducing the pollution of lead dust to environment and injury to a human body.