Battery replacement type battery box fixing structure, electric truck and electric engineering machinery

The utility model relates to a battery-changing type electric truck, aims to solve the problem that a battery-changing type battery box in an existing electric truck is installed in a vertical battery-changing mode, and provides a battery-changing type battery box fixing structure, an electric truck and engineering machinery. Two guide rails are arranged on the base, a box body of the battery-changing type battery box is provided with a sliding supporting piece capable of sliding on the guide rails, and a plurality of opening and closing locking devices for limiting and fixing the battery-changing type battery box relative to the base are arranged on the left side and the right side; the sliding supporting piece is provided with a supporting part capable of making contact with the guide rail, the rear end of the sliding supporting piece is provided with a roller downwards protruding out of the supporting part, the rear end of the guide rail is provided with a downwards-inclined slope, and the descending heigh