The invention discloses a building foundation pillar and a protection structure thereof, and relates to the technical field of building foundation pillars. The building foundation pillar comprises a foundation pillar and ground. The surface of the foundation pillar is fixedly connected with a containing platform, the two sides of the bottom of the containing platform are fixedly connected with fixing plates, one sides of the fixing plates are fixedly connected with fixing boxes, and the position, located at the bottom of the containing platform, of the surface of the foundation pillar is sleeved with an annular protection cover. According to the building foundation pillar and the protection structure thereof, the stability of a building is greatly improved, when the foundation pillar suffers from collisions caused by human factors or other factors, impact force generated by the collisions can be well buffered, potential safety hazards caused by damage or inclination of the foundation pillar to a user are avoided, the protection performance is high, the stability of the foundation pillar can be well enhanced, multiple levels of protection are achieved when the foundation pillar shakes, some objects can be put on the foundation pillar by the user, when it is damp, water in a foundation table and the foundation pillar can be drained, and the service life and the quality of the foundation pillar are guaranteed.