The invention relates to an isolation type vacuum circuit breaker and a body thereof. The isolation type vacuum circuit breaker comprises a vacuum cavity body; a static contact and a moving contact are arranged on the inner edge of the vacuum cavity body in the up-down direction in sequence; the moving contact is in transmission connection with an operating mechanism to realize a stressed end which moves in a reciprocating manner up and down; the circuit breaker body also comprises a grounding block integrated on the vacuum cavity body; the moving contact has a switch-on position in connectionwith the static contact in the reciprocating travel, a switch-off position disconnected from the static contact, and a grounding position electrically connected with the grounding block. The isolation type vacuum circuit breaker disclosed in the invention realizes functions of a vacuum circuit breaker, an isolation switch and a grounding switch; and in addition, the grounding block is integratedon the vacuum cavity body, so that switching of three states of switching on, switching off and grounding can be realized by only driving the moving contact, so that high degree of integration is realized, the size of the isolation type vacuum circuit breaker is reduced and the occupied area of a transformer substation is reduced.