An electronic expansion valve, comprising: a valve body having a first valve port; a valve needle, wherein the valve needle has a closed position abutting against the first valve port and an open position away from the first valve port, a bottom of the valve needle is provided with a second valve port in communication with the first valve port, the valve needle is provided with an accommodation space and a first flow passage and a second flow passage both in communication with the accommodation space, the first flow passage is located in a side wall of the valve needle and is in communication with an outside, and the second flow passage is located at a peripheral outer side of the second valve port and is in communication with the second valve port; a valve stem, wherein the valve stem is arranged to allow at least a part of the valve stem to penetrate into the accommodation space, and the valve stem is movable up and down, to adjust a flow rate at the second valve port; a first silencing portion, wherein the first silencing portion is arranged in the accommodation space, to allow a fluid entering from the first flow passage to pass through the first silencing portion to flow to the second flow passage; a first sealing portion, wherein the first sealing portion is arranged in the accommodation space and located between the first silencing portion and the second flow passage, the first sealing portion is provided with a third flow passage, and the accommodation space is in communication with the second flow passage through the third flow passage; and a driving portion configured to drive the valve stem to move up and down; and wherein a stop member is provided between the valve stem and the valve needle, to allow the valve needle and the valve stem to move synchronously when the valve needle is in contact with the valve stem through the stop member; and the stop member is also configured to allow the valve stem to move up and down with respect to the valve needle when the valve needle is located at the closed position. a valve body having a first valve port; a valve needle, wherein the valve needle has a closed position abutting against the first valve port and an open position away from the first valve port, a bottom of the valve needle is provided with a second valve port in communication with the first valve port, the valve needle is provided with an accommodation space and a first flow passage and a second flow passage both in communication with the accommodation space, the first flow passage is located in a side wall of the valve needle and is in communication with an outside, and the second flow passage is located at a peripheral outer side of the second valve port and is in communication with the second valve port; a valve stem, wherein the valve stem is arranged to allow at least a part of the valve stem to penetrate into the accommodation space, and the valve stem is movable up and down, to adjust a flow rate at the second valve port; a first silencing portion, wherein the first silencing portion is arranged in the accommodation space, to allow a fluid entering from the first flow passage to pass through the first silencing portion to flow to the second flow passage; a first sealing portion, wherein the first sealing portion is arranged in the accommodation space and located between the first silencing portion and the second flow passage, the first sealing portion is provided with a third flow passage, and the accommodation space is in communication with the second flow passage through the third flow passage; and a driving portion configured to drive the valve stem to move up and down; and