The vacuum arc extinguishing chamber for circuit breakers adopts a ceramic insulation shell and a cup-shaped longitudinal magnetic, middle sealed fixed shielding cylinder structure, copper chromium contact material. It has the characteristics of large breaking capacity, high insulation level, strong arc extinguishing ability, and long service life. The vacuum circuit breaker matched with it has the advantages of simple maintenance, no explosion hazard, no pollution, and low noise. It can be widely used for control and protection of power transmission and distribution systems such as electricity, machinery, metallurgy, chemical industry, and mining.