A fastening clamp, used for connecting a first component to a second component having a connecting post, comprising: a substrate (101, 501) on which a mounting hole is provided, wherein the mounting hole is used to receive the connecting post of the second component; at least two first retaining legs (103, 104, 105), proximal ends of the at least two first retaining legs (103, 104, 105) connected to an edge of the mounting hole and extending obliquely from one side of the substrate (101, 501) towards one another in a direction away from the substrate (101, 501), the at least two first retaining legs (103, 104, 105) being resilient and configured to deflect about the proximal ends of the at least two first retaining legs (103, 104, 105); and at least two second retaining legs (113, 114, 115), proximal ends of the at least two second retaining legs (113, 114, 115) connected to the edge of the mounting hole and extending obliquely from one side of the substrate (101, 501) towards one another in a direction away from the substrate (101, 501), the at least two first retaining legs (103, 104, 105) and the at least two second retaining legs (113, 114, 115) being on the same side of the substrate (101, 501); wherein distal ends of the at least two second retaining legs (113, 114, 115) are closer to the substrate (101, 501) than distal ends of the two first retaining legs (103, 104, 105), and the at least two first retaining legs (103, 104, 105) and the at least two second retaining legs (113, 114, 115) are configured to be able to collectively retain the connecting post of the second component in the mounting hole, characterised in that each of the at least two first retaining legs (103, 104, 105) comprise an extension portion and a body portion located between the substrate (101, 501) and the extension portion, wherein the body portion is inclined at a greater angle with respect to the substrate (101, 501) than the extension portion is inclined with respect to the substrate (101, 501). at least two first retaining legs (103, 104, 105), proximal ends of the at least two first retaining legs (103, 104, 105) connected to an edge of the mounting hole and extending obliquely from one side of the substrate (101, 501) towards one another in a direction away from the substrate (101, 501), the at least two first retaining legs (103, 104, 105) being resilient and configured to deflect about the proximal ends of the at least two first retaining legs (103, 104, 105); and at least two second retaining legs (113, 114, 115), proximal ends of the at least two second retaining legs (113, 114, 115) connected to the edge of the mounting hole and extending obliquely from one side of the substrate (101, 501) towards one another in a direction away from the substrate (101, 501), the at least two first retaining legs (103, 104, 105) and the at least two second retaining legs (113, 114, 115) being on the same side of the substrate (101, 501); wherein distal ends of the at least two second retaining legs (113, 114, 115) are closer to the substrate (101, 501) than distal ends of the two first retaining legs (103, 104, 105), and the at least two first retaining legs (103, 104, 105) and the at least two second retaining legs (113, 114, 115) are configured to be able to collectively retain the connecting post of the second component in the mounting hole, characterised in that each of the at least two first retaining legs (103, 104, 105) comprise an extension portion and a body portion located between the substrate (101, 501) and the extension portion, wherein the body portion is inclined at a greater angle with respect to the substrate (101, 501) than the extension portion is inclined with respect to the substrate (101, 501).