Armrest box assembly and automobile

The invention discloses an armrest box assembly and an automobile. The armrest box assembly comprises a central armrest box capable of being used as an armrest and a seat and a guide rail used for being connected with an automobile body floor. The central armrest box comprises a box body which can be used as a seat base and an armrest cover which can be used as an armrest and a seat backrest; the rear end of the armrest cover is hinged to the box body, and the armrest cover has a closed state capable of being used as an armrest and an open state capable of being used as a seat backrest; the guide rail extends in the front-back direction, and the box body is connected with the guide rail in a sliding mode. According to the armrest box assembly and the automobile, the central armrest box can be adjusted front and back between the front row of seats and the second row of seats, a channel between the second row of seats can be utilized, the second row of seats can be changed into three seats from two seats, and h