An electronic expansion valve, comprising: a valve seat assembly; a first pipe connecting portion; and a second pipe connecting portion, wherein, the valve seat assembly comprises an outer wall portion and a valve port portion provided with a valve port, the electronic expansion valve further comprises a first valve seat chamber and a second valve seat chamber, at least most part of the first valve seat chamber is located above the valve port portion, and at least most part of the second valve seat chamber is below the valve port portion, the valve port is configured to communicate the first valve seat chamber with the second valve seat chamber, the first pipe connecting portion is fixedly connected to the outer wall portion, and a connection portion between the first pipe connecting portion and the outer wall portion is relatively close to the first valve seat chamber, the second pipe connecting portion is fixedly connected to the outer wall portion, and a connection portion between the second pipe connecting portion and the outer wall portion is relatively close to the second valve seat chamber, a diameter of the second valve seat chamber relatively close to the valve port portion is greater than a diameter of the second pipe connecting portion, and the diameter of the valve port is less than a diameter of the second valve seat chamber; and wherein the outer wall portion is an integrated structure, and the outer wall portion is in interference fit with the valve port portion or the outer wall portion is fixed to the valve port portion by welding, the outer wall portion comprises a circumferential wall portion and a bottom wall portion, a first port portion is provided on the circumferential wall portion, at least most part of the first port portion is located above the valve port portion, a second port portion is provided on the bottom wall portion, and the second port portion is located below the valve port portion; and an inner chamber of the first pipe connecting portion is in direct communication with the first valve seat chamber, and an inner chamber of the second pipe connecting portion is in direct communication with the second valve seat chamber. a valve seat assembly; a first pipe connecting portion; and a second pipe connecting portion, wherein, the valve seat assembly comprises an outer wall portion and a valve port portion provided with a valve port, the electronic expansion valve further comprises a first valve seat chamber and a second valve seat chamber, at least most part of the first valve seat chamber is located above the valve port portion, and at least most part of the second valve seat chamber is below the valve port portion, the valve port is configured to communicate the first valve seat chamber with the second valve seat chamber, the first pipe connecting portion is fixedly connected to the outer wall portion, and a connection portion between the first pipe connecting portion and the outer wall portion is relatively close to the first valve seat chamber, the second pipe connecting portion is fixedly connected to the outer wall portion, and a connection portion between the second pipe connecting portion and the outer wall portion is relatively close to the second valve seat chamber, a diameter of the second valve seat chamber relatively close to the valve port portion is greater than a diameter of the second pipe connecting portion, and the diameter of the valve port is less than a diameter of the second valve seat chamber; and wherein the outer wall portion is an integrated structure, and the outer wall portion is in interference fit with the valve port portion or the outer wall portion is fixed to the valve port portion by welding, the outer wall portion comprises a circumferential wall portion and a bottom wall portion, a first port portion is provided on the circumferential wall portion, at least most part of the first port portion is located above the valve port portion, a second port portion is provided on the bottom wall portion, and the second port portion is located below the valve port portion; and an inner chamber of the first pipe connecting portion is in direct communication with the first valve seat chamber, and an inner chamber of the second pipe connecting portion is in direct communication with the second valve seat chamber.