The present invention relates to fire-extinguishing equipment integrated with a secondary battery system for early detection and early extinguishing for reducing the risk of fire spreading inside battery modules, and, more specifically, the present invention comprises: a plurality of battery modules constituting a secondary battery system; module unit fire detection devices mounted inside the modules so as to sense a fire in advance; and integrated fire extinguishing equipment partially coupled to the battery modules so as to directly spray a fire extinguishing agent at the inside of each module, wherein the battery modules include additional members for a cooling effect and the instantaneously supply of a fire-extinguishing agent when a fire is detected.