The invention relates to the technical field of a storage battery, in particular to a maintenance-free lead-acid storage battery negative electrode plate and a preparation method thereof. The negativeelectrode plate for the storage battery comprises the following raw materials based on weight parts: 80-120 parts of lead powder, 0.6-1.2 parts of barium sulfate, 0.5-1.0 part of carbon black and 0.2-0.5 part of lignin. In the negative electrode plate for the storage battery, the negative electrode plate is enabled to develop optimal performance on an aspect of low-temperature performance by a reasonable proportion, the problems of surface area shrinkage and passivation of the negative electrode plate under a low-temperature environment are solved, the starting performance of the storage battery under the low-temperature environment is improved, and the service lifetime of the storage battery is prolonged.