The invention relates to a through-flow structure of a high-voltage switch and a moving contact of the through-flow structure. The through-flow structure of the high-voltage switch comprises a fixed contact and a moving contact; the fixed contact comprises a fixed contact finger and a fixed arc contact, wherein the fixed contact finger is annularly arranged; the moving contact comprises a moving contact rod and a moving arc contact arranged at the front end of the contact rod; the fixed arc contact is a columnar contact coaxially arranged in the middle of the fixed contact finger; an open holeis formed in the front end of the moving arc contact; a moving contact finger matched with the outer circumferential surface of the fixed arc contact is arranged in the open hole; the front end of the moving contact finger is located at the inner side of the opening of the open hole; and the fixed arc contact is higher than the fixed contact finger. In a switching-on process, the moving contact finger contacts with the fixed arc contact firstly, and then, the moving arc contact contacts with the fixed contact finger; the moving contact finger bears arc gap current in a pre-breakdown process,and the fixed contact finger bears rated current generated after switching-on; the vibration of the moving contact under the action of an electrodynamic force can be limited; and peak current can be effectively conducted.