An electronic expansion valve includes a valve seat component, including a valve seat and a valve core seat; and a valve rod component, capable of axially moving along a core cavity of the valve core seat to open or close a valve port. The valve rod component is provided with an axial through hole communicated with the valve port and a sealing surface capable of being adhered to and sealing the valve port. The valve rod component includes a valve rod and a valve core fixedly disposed at a lower end of the valve rod. The valve rod is a cylindrical body, including a small-diameter cylinder body and a large-diameter cylinder body close to the valve port. A first gap is provided between the large-diameter cylinder body and the valve core seat, and a second gap is provided between the valve core and the valve port.