The utility model discloses a foldable business tool bag, which belongs to the field of electric power tool bags and comprises a bag body, straps and lock catches, the straps are connected with the bag body through the lock catches, and the bottom of the bag body is folded upwards to form isolation division of a cavity in the bag. According to the utility model, the bottom of the bag body is folded upwards to form isolation division of the bag flower cavity, so that the bag inner cavity of the bag body is isolated, and the capacity of the bag body is increased.