The invention relates to a magnetorheological building foundation column, and belongs to the technical field of building seismic fortification. The foundation column is in a discontinuous hollow cylindrical shape, and a hollow cavity is filled with magnetorheological fluid; the inner wall of the foundation column is smooth, coils are wound around the inner wall of the foundation column, and the outer wall of the foundation column is a rough surface. The magnetorheological fluid in the foundation column is subjected to a magnetorheological phenomenon when a building is subjected to an earthquake, by using the energy absorption effect in the change process of the magnetorheological fluid, a part of vibrations, shakes and the like which are caused by the earthquake and are about to attack thebuilding are absorbed, so that destruction caused by the earthquake to the building is reduced or delayed, in this way, damage to the building is reduced, and more escape time is earned for people inthe building. The foundation column is provided with an earthquake monitor to detect the earthquake intensity and the earthquake duration time; the building is internally provided with an angle sensor which is used for detecting the inclination degree of the building in the earthquake; a result which a system detects according to the earthquake monitor and the angle sensor controls the working state of the magnetorheological foundation column in each direction.