The invention relates to a battery intelligent detection and charging maintenance device, comprising a charging power supply module, wherein, an output end of the charging power supply module is respectively connected with an input end of a protection module and a multi-output DC/DC conversion module, and an output end of the protection module is connected with an input end of the battery; A battery output terminal is respectively connected with an input terminal of a discharge control module and a state information acquisition module, The output end of the state information acquisition moduleis connected with the input end of the signal conditioning module, the output end of the signal conditioning module is connected with the input end of the isolation driving module, the output end ofthe isolation driving module is connected with the input end of the charging control module, and the output end of the charging control module is connected with the input end of the charging power module. The isolated driving module is bidirectionally communicated with the processor and the peripheral circuit module, and the output terminals of the processor and the peripheral circuit module are connected with the input terminals of the discharge control module. The device of the invention is suitable for a plurality of kinds of batteries, and has the functions of charging, detecting, maintaining and managing the batteries, thereby prolonging the service life of the batteries.