The invention provides a contact assembly and a grounding switch using the same, and a metal-enclosed switchgear. The contact assembly comprises a contact finger and a contact rod which are used for inserting; the contact finger and the contact rod are provided with access sides and conductive contact surfaces; the contact finger and the contact rod are fixedly provided with arc guiding members or arc guiding layers which are positioned on the conductive contact surface; the arc-guiding members or the arc-guiding layers which are made of the copper-tungsten alloy material are reserved at the access sides of the contact finger and the contact rod and the rest part is made of the pure copper material, so that the electric arc between the contact head and the contact finger acts on the arc-guiding member or the arc-guiding layer when a gap is produced through relatively opening the contact rod and the contact finger in the process of breaking and closing switch; after the contact rod and the contact finger are well inserted, the conductive contact surfaces of the contact rod and the contact finger are made of the pure copper materials and contact resistance of the pure copper material is smaller than that of the copper tungsten alloy, so that the conductivity is good, and the conductive performance between the contact rod and the contact finger is good and stable.