An electronic expansion valve. A main valve thereof (11) has fixed therein a sleeve cylinder (4). The lower end part of the sleeve cylinder (4) is supported by a valve base (1). Also, the lower end part of the sleeve cylinder (4) surrounds a main valve opening (441). A valve core base (2) is arranged movably along the axial direction within the sleeve cylinder (4). The lower part of the valve needle component (3) extends into the sleeve cylinder (4) to open and close the valve core valve opening (21). The valve cylinder (4) is provided on a circumferential sidewall thereof with a first flow hole (41) in proximity to the main valve opening (441), and a second flow hole (42) away from the main valve opening (441). When a coolant is flowing forwards, the structural design of the electronic expansion valve is capable of preventing the highly pressurized coolant from causing an excessive impact on the valve core base, thus preventing same from being displaced from the center.
