The invention discloses a three-way catalyst structure. The three-way catalyst structure comprises a catalyst shell, wherein the catalyst shell is a cylinder with the closed bottom end; a catalytic body is fixed in the catalyst shell, is cylindrical and is coaxial with the catalyst shell; an activated carbon layer is fixed on the outer wall of the catalytic body; the outer diameter of the activated carbon layer is smaller than the inner diameter of the catalyst shell; a circular through hole is formed in the catalytic body along the axis; an exhaust port is formed in the bottom end of the catalyst shell; a ventilating pipe is fixed in the exhaust port; the top end of the ventilating pipe is sealed and is placed in the circular through hole of the catalytic body; ventilating holes are formed in the ventilating pipe; the end surface of the top end of the ventilating pipe is aligned with the end surface of the catalytic body; the top end of the catalyst shell is conical; and an air inlet is formed in the top end of the catalyst shell. The invention aims to provide the three-way catalyst structure, blockage of the catalytic body by carbon deposition and complexes is relieved, and the service life of the three-way catalyst structure is prolonged.