The invention discloses a permanent-magnet vacuum circuit breaker, which comprises a circuit breaker shell body, three vacuum circuit breaker bodies and a permanent-magnet actuating mechanism, wherein each vacuum circuit breaker comprises a vacuum arc-extinguishing chamber, a movable contact, a fixed contact and an insulation draw rod which is connected with the movable contact, the permanent-magnet actuating mechanism comprises three driving components, a main shaft, a driving turn arm which is arranged on the middle portion of the main shaft, a permanent-magnet driving mechanism which is used for driving the main shaft to rotate, and two breaking spring assemblies, wherein the two breaking spring assemblies are symmetrically arranged on both sides of the driving turn arm, each breaking spring assembly comprises a breaking spring and a breaking spring driving turn arm, wherein the breaking spring driving turn arm is fixed on the main shaft, the upper end of the breaking spring is correspondingly fixed with the shell body of the circuit breaker, and the lower end thereof is connected with the breaking spring driving turn arm. The invention has the advantages that the stability and the reliability are effectively guaranteed during the long-term use, simultaneously, the cost is reduced as much as possible, and the service life of the whole machine is prolonged.