An electric automobile and a power grid interactive simulation load system, and an electrical protection method therefor. The system comprises a battery system, a bidirectional AC/DC module, a grid-connected control protection module and a monitoring terminal, wherein the battery system comprises a battery and a battery management system connected to the battery; the monitoring terminal is connected to the battery management system, the bidirectional AC/DC module and the grid-connected control protection module, respectively; the battery management system is further connected to the bidirectional AC/DC module; the bidirectional AC/DC module is connected to a power grid through a circuit breaker; the bidirectional AC/DC module is further connected to the grid-connected control protection module; and the grid-connected control protection module is connected to a power grid through a circuit breaker. The electrical safety problem of a device during a simulation load working process and the grid-connected safety problem when accessing a power grid are solved, and the safety of the device is improved.