A switch unit, wherein the switch unit is configured to be applied to a switch, the switch comprises optionally a knob, the switch unit, and an operating mechanism connected between the knob and the switch unit, the knob is capable of controlling, by using the operating mechanism, the switch unit to be opened or closed, and the switch unit comprises: an arc-extinguishing functional component; a fixed contact assembly, located inside the arc-extinguishing functional component; a moving contact, located inside the arc-extinguishing functional component and capable of moving relative to the fixed contact assembly, wherein the moving contact is connected to the fixed contact assembly when the switch unit is closed, the moving contact is separated from the fixed contact assembly when the switch unit is opened, and an electric arc is formed between the moving contact and the fixed contact assembly in a separation process; and a first magnet assembly, wherein the first magnet assembly is configured such that directions of at least some magnetic induction lines of the first magnet assembly intersect a current direction of the electric arc to drive the electric arc to move towards the arc-extinguishing functional component, the first magnet assembly comprises a first magnet and a second magnet that are disposed at an interval, the first magnet and the second magnet are both configured to increase a movement path of the electric arc and increase a contact area between the electric arc and the arc-extinguishing functional component to improve cooling effect of the arc-extinguishing functional component on the electric arc, characterized in that the fixed contact assembly comprises a first fixed contact and a second fixed contact that are spaced apart; the moving contact comprises a first terminal and a second terminal that are disposed opposite to each other; the operating mechanism is capable of controlling the moving contact to rotate; when the switch unit is closed, the first terminal and the second terminal are respectively connected to the first fixed contact and the second fixed contact to conduct a current; when the switch unit is opened, the moving contact is rotated to separate the first terminal from the first fixed contact and separate the second terminal from the second fixed contact, to cut off the current and form a first electric arc between the first terminal and the first fixed contact; the first magnet and the second magnet are located on one side of the first electric arc; and the first magnet and the second magnet are both configured to increase a movement path of the first electric arc and increase a contact area between the first electric arc and the arc-extinguishing functional component. an arc-extinguishing functional component; a fixed contact assembly, located inside the arc-extinguishing functional component; a moving contact, located inside the arc-extinguishing functional component and capable of moving relative to the fixed contact assembly, wherein the moving contact is connected to the fixed contact assembly when the switch unit is closed, the moving contact is separated from the fixed contact assembly when the switch unit is opened, and an electric arc is formed between the moving contact and the fixed contact assembly in a separation process; and a first magnet assembly, wherein the first magnet assembly is configured such that directions of at least some magnetic induction lines of the first magnet assembly intersect a current direction of the electric arc to drive the electric arc to move towards the arc-extinguishing functional component, the first magnet assembly comprises a first magnet and a second magnet that are disposed at an interval, the first magnet and the second magnet are both configured to increase a movement path of the electric arc and increase a contact area between the electric arc and the arc-extinguishing functional component to improve cooling effect of the arc-extinguishing functional component on the electric arc, characterized in that the fixed contact assembly comprises a first fixed contact and a second fixed contact that are spaced apart; the moving contact comprises a first terminal and a second terminal that are disposed opposite to each other; the operating mechanism is capable of controlling the moving contact to rotate; when the switch unit is closed, the first terminal and the second terminal are respectively connected to the first fixed contact and the second fixed contact to conduct a current; when the switch unit is opened, the moving contact is rotated to separate the first terminal from the first fixed contact and separate the second terminal from the second fixed contact, to cut off the current and form a first electric arc between the first terminal and the first fixed contact; the first magnet and the second magnet are located on one side of the first electric arc; and the first magnet and the second magnet are both configured to increase a movement path of the first electric arc and increase a contact area between the first electric arc and the arc-extinguishing functional component.