An installation structure of a water outlet valve, comprising: a body and an installation fixture; the body being disposed with a cavity having an opening at the side facing an installation surface; the installation fixture being disposed with an insertion portion and an abutting portion; characterized in that the cavity is axially extending through the body; and the installation structure further comprises an installation shaft being disposed in the cavity inside the body and extending along an axial direction of the body, an axial direction defined by the installation shaft corresponding to the axial direction of the body, wherein the installation shaft defines a through installation cavity along the axial direction thereof; wherein the through installation cavity of the installation shaft is configured to be entered by the insertion portion of the installation fixture from a side of the through installation cavity away from the installation surface and pass the installation fixture therethrough, such that the abutting portion of the installation fixture remains located in the through installation cavity and abuts an inner wall of the through installation cavity at the side of the through installation cavity near the installation surface, whereas the insertion portion of the installation fixture extends outward from the through installation cavity of the installation shaft through an opening at the side of the through installation cavity near the installation surface; the insertion portion of the installation fixture further extending outward from the opening of the body at the side facing the installation surface to be inserted to the installation surface. the body being disposed with a cavity having an opening at the side facing an installation surface; the installation fixture being disposed with an insertion portion and an abutting portion; characterized in that the cavity is axially extending through the body; and the installation structure further comprises an installation shaft being disposed in the cavity inside the body and extending along an axial direction of the body, an axial direction defined by the installation shaft corresponding to the axial direction of the body, wherein the installation shaft defines a through installation cavity along the axial direction thereof; wherein the through installation cavity of the installation shaft is configured to be entered by the insertion portion of the installation fixture from a side of the through installation cavity away from the installation surface and pass the installation fixture therethrough, such that the abutting portion of the installation fixture remains located in the through installation cavity and abuts an inner wall of the through installation cavity at the side of the through installation cavity near the installation surface, whereas the insertion portion of the installation fixture extends outward from the through installation cavity of the installation shaft through an opening at the side of the through installation cavity near the installation surface; the insertion portion of the installation fixture further extending outward from the opening of the body at the side facing the installation surface to be inserted to the installation surface.