Added elevator supported by middle column and directly accessing to original gate of household

The invention provides an added elevator supported by a middle column and directly accessing to an original gate of a household. The added elevator supported by the middle column and directly accessing to the original gate of the household is arranged outside an old building, a stair support column is added in the middle of a stair cross beam of each half-storey platform, steel bars are inserted into new holes in the middle of the stair cross beam and the added stair support column and are poured into an integrated middle column, the middle column is provided with overhanging side beams whichextend outwards for supporting a stepless walkway and stairs, the stepless walkway is arranged between a gate platform and an elevator doorway platform, and the stair on the other side is rebuilt to be connected with the elevator doorway platform. The added elevator supported by the middle column and directly accessing to the original gate of the household, disclosed by the invention, has the effects that residents do not