The invention discloses a knife switch, and relates to the field of low-voltage electrical apparatus components. The knife switch comprises a base, a knife-shaped moving contact, an insulating board,a static contact, pillars and springs; the static contact is fixed to the base; a second U-shaped groove is formed in the outer side of the static contact; the pillars are arranged at the two sides ofthe static contact; the pillars are fixed to the base; the springs are arranged on the pillars; one end of each spring is fixed to the corresponding pillar, and the other end of each spring is arranged in the second U-shaped groove of the static contact; the base is further provided with the knife-shaped moving contact; the insulating board is arranged at the outer side of the knife-shaped movingcontact; a protrusion is arranged at the top of the knife-shaped moving contact. The moving contact and the static contact of the knife switch can be in close contact with each other, the situation that electric arcs are generated due to poor contact is avoided, and the knife switch has the advantages of being safe and reliable, long in service life, simple in structure, reasonable in arrangementand low in manufacturing cost.