The invention discloses a contact mechanism in a four-breakpoint contactor. The contact mechanism comprises a moving contact structure, a static contact structure and an arc extinguishing structure; the moving contact structure comprises a first moving contact, a second moving contact, a moving contact support, two overtravel springs, three clamp springs, two guide rods and a connection rod, the moving contact support is arranged on the top of the connection rod in a sleeving mode through one of the clamp springs and provided with a first end and a second end, and the two guide rods are vertically arranged at the first end and the second end of the moving contact support respectively; the static contact structure comprises a first static contact, a second static contact, a third static contact, a fourth static contact, a conducting plate and a ceramic base, four hollow holes are formed in the ceramic base, the bottoms of the first static contact, the second static contact, the third static contact and the fourth static contact are each provided with a static contact point which is exposed out through one hollow hole, and the tops of the first static contact and the second static contact are connected through the conducting plate; and the arc extinguishing structure comprises four permanent magnets and two permanent magnet pressing plates which are each in the shape shown in thespecification and are arranged at the periphery of the ceramic base in an enclosing mode.