The utility model discloses a switching operation simulation preview system, include: switching operation simulates the central data processor of an auxiliary engine, transmission and the storage switching operation preview data of preview and lies in the host computer and the 2nd auxiliary engine of on -the -spot transformer substation, an auxiliary engine the host computer and the 2nd auxiliary engine respectively with center data processor communication connection, an auxiliary engine with the 2nd auxiliary engine is equipped with alarm device respectively. The utility model discloses the owner has, the reciprocal of auxiliary engine information is presented and voice broadcast prevents mistake suggestion, realizes switching operation preview and actual switching operation's information feedback and counterpoint with real -time that the security is higher.