The invention relates to a permanent magnet vacuum unidirectional switch and a multifunctional composition switch provided with the same. The permanent magnet vacuum unidirectional switch comprises a shell, a vacuum circuit breaker and a permanent magnet driving mechanism, wherein, the vacuum circuit breaker comprises a stationary contact end and a dynamitic contact end; the permanent magnet driving mechanism drives the stationary contact end and the dynamitic contact end to be closed, and comprises an insulator; a counter-force spring which drives the dynamitic contact end to move is sheathed on the dynamitic contact end; the dynamitic contact end is in clearance fit with the insulator, and is not directly connected with the insulator, the permanent magnet driving mechanism drives the stationary contact end and the dynamitic contact end to be closed through the insulator, and when in closing, the dynamitic contact end and the insulator can automatically find a concentricity, thus avoiding the problems such as abrasion, unequal contact surfaces and the like. By utilizing the composition switch, the closing and openness of a plurality of permanent magnet vacuum unidirectional switches can be combined and controlled, thus the composition switch has a breaker function, a contactor function, a contactor reversing function, a breaker and contactor function and a breaker and contactor reversing function, thus satisfying the requirements of electricity utilization of different equipment; and the adaptability is more comprehensive.