The invention provides a thread-type contact for a high-voltage SF6 circuit breaker. The arc extinguishing chamber of the high-voltage SF6 circuit breaker comprises: a static main contact, a large nozzle, a movable main contact, an air cylinder, a static arc contact, a shielding cover, a small nozzle, a movable arc contact and a piston. The surfaces of the arc blowing parts of the static arc contact and the movable arc contact are processed into a thread shape. In the invention, the SF6 airflow flowing at the high speed does not simply move in the axial direction of the breaker before being blown to an arc area due to the existence of the internal threads of the contact, and the SF6 airflow has a rotary motion with a certain angle deviating from the radial direction of the breaker. The speed of the high-speed SF6 gas has the axial component of the circuit breaker and has the high speed component in the radial direction of the circuit breaker, so that the heat in an electric arc area can be rapidly taken away, and the arc quenching capacity of the circuit breaker is improved. For the circuit breaker with the same volume, due to the change of the inside of the contact, the capacity of the circuit breaker is increased, and the arc extinguishing performance is further improved.