The present invention relates to a fixing element, comprising a buckling part and a pressing part. The buckling part is formed by plastic cement with high toughness; the fixing element is characterized in that the buckling part is provided with a through hole, one end of the buckling part is provided with an elastic tenon section with an opening, and the other end of the buckling part is provided with a section of resisting ring edge; the upper section of the pressing part is wider while the lower section of the same is narrower; the outside diameter of the pressing part is constantly greater than the outside diameter of the buckling part; the pressing part is a hollow rod body of the through hole, and the lower section of the pressing part is a ring in a protruding form which is formed integrally; the arrangement that the fixing element is matched with two parts is that the elastic tenon section on one end of the buckling part passes through corresponding holes of the two parts, the upper end and the lower end of the buckling part are respectively resisted against outsides of the two parts, the pressing part is inserted in the hole of the buckling part, the interior of the hole of the buckling part can be extruded by the protruding ring of the pressing part, and the fixing element arranged between the two parts can be firmly positioned.