The invention discloses a method for calculating the reasonable depth of a steel pipe column embedded into a pile foundation, which comprises the following steps of: (1) applying bending moment M andvertical axial force to a top longitudinal beam of the steel pipe column, and obtaining corresponding column foot joint corners Theta of the steel pipe column under different bending moments through numerical simulation; (2) fitting the applied bending moment M and the column foot joint corner Theta data, and establishing bending moment -column foot joint corner data relation curve; (3) Establishing a fitting formula for the column foot joint corner relation curve to obtain the bending rigidity k Theta of the column foot joint; And (4) obtaining bending stiffness ratio Lambda of the parametercolumn joint from the bending stiffness k theta of the steel column column joint, that is, the ratio of the bending stiffness k theta of the column joint to the rigidity of the steel column itself.. The reasonable depth of the steel pipe column embedded into the pile foundation can be determined, the space, outside the contour of a station, of the steel pipe column is reduced to the minimum, the safety of the steel pipe column of the underground excavation station in the construction stage is guaranteed, and the crossing condition is reserved for subsequent underground engineering construction.