The invention discloses a rack foot of a safety box, which comprises a foot wheel assembly. The rack foot of the safety box is characterized by comprising a rack foot enclosing plate, the foot wheel assembly and a limiting element, wherein the rack foot enclosing plate is connected to the bottom of the safety box to form a cavity for hiding the foot wheel assembly; the foot wheel assembly is rotatably installed and fixed in the cavity of the rack foot enclosing plate; the limiting element detachably penetrates through the rack foot enclosing plate, and the inner end of the limiting element is in direct or indirect limit matching with a foot wheel fixing bracket of the foot wheel assembly; in the state that the inner end of the limiting element and the foot wheel fixing bracket of the foot wheel assembly are in limit matching, the foot wheel part of the foot wheel assembly is exposed under the rack foot enclosing plate and can freely move; and in the state that the inner end of the limiting element and the foot wheel fixing bracket of the foot wheel assembly are in limit separation, the foot wheel assembly is integrally hidden into the cavity of the rack foot enclosing plate, the bottom of a box body is in seamless contact with the ground, and the rack foot of the safety box can prevent sundries from entering and is more attractive.