The invention discloses a replaceable foot structure for a legged landing gear. The replaceable foot structure comprises a mechanical connection interface, a force sensor and a replaceable foot end, wherein the upper end of the replaceable foot end is detachably connected to the lower end of the force sensor; the upper end of the force sensor is connected to the mechanical connection interface; and the form of the replaceable foot end comprises, but not limited to, a buffer type foot end, a disk type foot end, an electromagnetic absorption type foot end and a spiny hemisphere type foot end. The replaceable foot structure designed by the invention can be used in cooperation with the legged landing gear, so that an aircraft can satisfy landing and parking requirements under the condition ofdifferent geology, topography and terrain.