An electronic expansion valve, wherein a valve rod is provided inside a valve cavity of the electronic expansion valve, the valve rod is axially movable along an axial through-hole of a valve seat (25,26) of the electronic expansion valve, to open or close a valve port arranged in the valve seat in order to allow or prevent the communication between two connecting ports (31,32) of the electronic expansion valve; wherein the valve rod is provided with an axial through-hole in communication with the valve port, a lateral wall of the axial through-hole of the valve seat is sealed with respect to the valve rod, an end surface of the valve rod comprises a sealing surface able to be in contact seal with an end surface at the valve port, the sealing surface comprises a first sealing surface configured to bear an acting force of a refrigerant at one connecting port, and a second sealing surface configured to bear an acting force of a refrigerant at another connecting port; and the first sealing surface has an effective pressure-bearing area equal to an effective pressure-bearing area of the second sealing surface, the effective pressure-bearing area being a projected area on a surface which is perpendicular to a direction of a pressure of the refrigerant; wherein the valve rod is a cylinder, which comprises a small-diameter section cylinder and a large-diameter section cylinder close to the valve port, the small-diameter section cylinder having an outer diameter and the large-diameter section cylinder having an outer diameter; wherein the first sealing surface comprises a portion of an end surface of the large-diameter section cylinder disposed radially outwardly of the outer diameter of the small-diameter section cylinder and the second sealing surface comprises a portion of the end surface of the large-diameter section cylinder disposed radially inwardly of the outer diameter of the small-diameter section cylinder; wherein an inner lateral wall of the axial through-hole of the valve seat is provided with a mounting groove, and a sealing ring is provided inside the mounting groove; wherein the valve seat comprises a valve core seat and a valve seat base, the valve core seat is inserted into the valve seat base, the axial through-hole of the valve seat is provided in the valve core seat, the axial through-hole of the valve core seat is a stepped hole, and the stepped hole forms a ring-shaped step surface facing a valve house of the electronic expansion valve; and wherein the valve seat further comprises a position-limiting sleeve, wherein the position-limiting sleeve is inserted into the stepped hole, an upper end portion of the position-limiting sleeve has a ring-shaped radial lug boss, the radial lug boss overlaps an upper end surface of the valve core seat, and the mounting groove is formed by an inner lateral wall of the valve core seat, a lower end surface of the position-limiting sleeve, and the ring-shaped step surface. wherein the valve rod is provided with an axial through-hole in communication with the valve port, a lateral wall of the axial through-hole of the valve seat is sealed with respect to the valve rod, an end surface of the valve rod comprises a sealing surface able to be in contact seal with an end surface at the valve port, the sealing surface comprises a first sealing surface configured to bear an acting force of a refrigerant at one connecting port, and a second sealing surface configured to bear an acting force of a refrigerant at another connecting port; and the first sealing surface has an effective pressure-bearing area equal to an effective pressure-bearing area of the second sealing surface, the effective pressure-bearing area being a projected area on a surface which is perpendicular to a direction of a pressure of the refrigerant; wherein the valve rod is a cylinder, which comprises a small-diameter section cylinder and a large-diameter section cylinder close to the valve port, the small-diameter section cylinder having an outer diameter and the large-diameter section cylinder having an outer diameter; wherein the first sealing surface comprises a portion of an end surface of the large-diameter section cylinder disposed radially outwardly of the outer diameter of the small-diameter section cylinder and the second sealing surface comprises a portion of the end surface of the large-diameter section cylinder disposed radially inwardly of the outer diameter of the small-diameter section cylinder; wherein an inner lateral wall of the axial through-hole of the valve seat is provided with a mounting groove, and a sealing ring is provided inside the mounting groove; wherein the valve seat comprises a valve core seat and a valve seat base, the valve core seat is inserted into the valve seat base, the axial through-hole of the valve seat is provided in the valve core seat, the axial through-hole of the valve core seat is a stepped hole, and the stepped hole forms a ring-shaped step surface facing a valve house of the electronic expansion valve; and wherein the valve seat further comprises a position-limiting sleeve, wherein the position-limiting sleeve is inserted into the stepped hole, an upper end portion of the position-limiting sleeve has a ring-shaped radial lug boss, the radial lug boss overlaps an upper end surface of the valve core seat, and the mounting groove is formed by an inner lateral wall of the valve core seat, a lower end surface of the position-limiting sleeve, and the ring-shaped step surface.