The invention provides a battery module with water-cooling heat dissipation for tabs. The battery module comprises a plurality of battery module units, wherein each battery module unit comprises a battery core group consisting of a plurality of battery cores, a front end plate arranged at the front side of the battery core group, a left side plate and a right side plate respectively arranged at the left side and right side of the battery core group, a rear end plate arranged at the rear side of the battery core group, a bracket arranged above the battery core group, and heat-dissipating fins and a water-cooling plate close to the bracket, wherein the bracket is provided with tabs which are arranged at the left side and right side of the bracket; the water-cooling plate is provided with a water feeding pipe, a water discharging pipe and a water-cooling pipeline, and the water-cooling pipeline is wholly U-shaped; the front end plate is provided with a water feeding pipeline, a water discharging pipeline, a positioning pin and a positioning groove, and a vertical water inlet connected with the water feeding pipe is formed in the water feeding pipe and above the front end plate; and a vertical water outlet connected with the water discharging pipe is formed in the water discharging pipe and above the front end plate. Different battery module units are connected and fixed by the positioning pin and the positioning groove. The battery module provided by the invention has the advantages that the heat-dissipating fins and the water-cooling plate are arranged above the tabs generating maximum heat, and the front end plate is provided with the water feeding pipeline and the water discharging pipeline communicated with the water-cooling plate, so that the heat-dissipation efficiency is high, the assembly is simple and the appearance is clean and tidy.