The invention discloses a central type household appliance and electric tool battery pack fixing device for fixing batteries to a household appliance and an electric tool. The central type household appliance and electric tool battery pack fixing device comprises the household appliance, the machine body of the electric tool and a battery pack, wherein the battery pack is provided with a shell formed by splicing an upper cover and a lower cover together; and a battery assembly is placed in the shell. The central type household appliance and electric tool battery pack fixing device is characterized in that the machine body is externally fixedly connected with a central shaft; the battery pack is provided with an insertion groove matched with the central shaft and internally provided with a cavity; and the insertion groove of the battery pack is inserted into the central shaft so as to carry out positioning and fixation. The central shaft type battery pack fixing device disclosed by the invention has the advantages that the battery pack is positioned and fixed by the central shaft, the central shaft is arranged outside the tool machine body, thereby hardly limiting the outline design of the tool machine body; and the battery pack is fixed outside the tool machine body, thereby being conductive to the radiation and reducing the potential safety hazard.