A stop structure for an electronic expansion valve, wherein the stop structure comprises: a nut comprising a pipe body comprising a first end and a second end, an outer peripheral wall of the first end of the pipe body being protruded with a limiting snap protrusion; and a connection seat connected to the first end of the pipe body, a first avoidance interval being provided between the limiting snap protrusion and the connection seat for installing a first stop of the spring guide rail; and a spring guide rail, wherein the spring guide rail comprises a guide portion sleeved on the pipe body, and a first stop provided at one end of the guide portion, wherein the first stop comprises a first axial segment connected to the guide portion, and a first circumferential segment connected to a tail end of the first axial segment, wherein the first axial segment extends along a length direction of the nut, wherein the first circumferential segment extends along the circumferential direction of the nut, wherein the first axial segment is located on one side of the limiting snap protrusion, and wherein the first circumferential segment is located in the first avoidance interval and abuts on a side surface of the limiting snap protrusion away from a second end of the pipe body, wherein the first stop further comprises a second axial segment connected to a tail end of the first circumferential segment, and wherein the second axial segment extends towards the second end of the pipe body, and is located on another side of the limiting snap protrusion, characterized in that the first stop further comprises a second circumferential segment connected to a tail end of the second axial segment, the second circumferential segment extending along the circumferential direction of the nut, wherein the second circumferential segment is located on a side of the limiting snap protrusion toward the second end of the pipe body, and wherein a tail end of the second circumferential segment is connected to the first axial segment and/or the guide portion. a nut comprising a pipe body comprising a first end and a second end, an outer peripheral wall of the first end of the pipe body being protruded with a limiting snap protrusion; and a connection seat connected to the first end of the pipe body, a first avoidance interval being provided between the limiting snap protrusion and the connection seat for installing a first stop of the spring guide rail; and a spring guide rail, wherein the spring guide rail comprises a guide portion sleeved on the pipe body, and a first stop provided at one end of the guide portion, wherein the first stop comprises a first axial segment connected to the guide portion, and a first circumferential segment connected to a tail end of the first axial segment, wherein the first axial segment extends along a length direction of the nut, wherein the first circumferential segment extends along the circumferential direction of the nut, wherein the first axial segment is located on one side of the limiting snap protrusion, and wherein the first circumferential segment is located in the first avoidance interval and abuts on a side surface of the limiting snap protrusion away from a second end of the pipe body, wherein the first stop further comprises a second axial segment connected to a tail end of the first circumferential segment, and wherein the second axial segment extends towards the second end of the pipe body, and is located on another side of the limiting snap protrusion, characterized in that the first stop further comprises a second circumferential segment connected to a tail end of the second axial segment, the second circumferential segment extending along the circumferential direction of the nut, wherein the second circumferential segment is located on a side of the limiting snap protrusion toward the second end of the pipe body, and wherein a tail end of the second circumferential segment is connected to the first axial segment and/or the guide portion.