The invention provides an isolation circuit breaker integrated with a voltage transformer, and the isolation circuit breaker comprises an A phase porcelain sleeve, a B phase porcelain sleeve, a C phase porcelain sleeve, a voltage transformer body, a voltage transformer wiring board, a connecting busbar, a bracket platform and an inclined bracket; and the A phase porcelain sleeve, the B phase porcelain sleeve and the C phase porcelain sleeve respectively comprise an upper porcelain sleeve, a lower porcelain sleeve and a isolation circuit breaker wiring board; the voltage transformer is arranged on the bracket platform, the voltage transformer wiring board on the top of the voltage transformer is connected with the isolation circuit breaker wiring board between the upper porcelain sleeve and the lower porcelain sleeve through the connecting busbar, and the bracket platform is fixed to a circuit breaker bracket through the inclined bracket. According to the invention, the isolation circuit breaker structure does not be changed, the bracket platform, the inclined bracket and the like are arranged on the outside only, and the original equipment is changed little; when the isolation circuit breaker is closed, the isolation circuit breaker supporting the ground insulation of sheathed tube can be ensured through reasonable equipment spacing design; two primary equipment including the isolation circuit breaker and the electronic-type voltage transformer are integrated, the integration level of the equipment is improved, and the land occupation area of the equipment is saved.