The invention provides a standby power supply automatic input system with inter-tripped loads, which comprises a main power supply, a standby power supply, a standby power supply automatic input device, a power supply bus and a plurality of loads. The loads comprise a main load and a plurality of secondary loads; the power supply bus is respectively connected with the main load, the secondary loads, the main power supply and the standby power supply; the standby power supply automatic input device is provided with a plurality of input contacts and output contacts; the input contacts are respectively connected with auxiliary contacts of circuit breakers on the secondary loads, an auxiliary contact of a circuit breaker on the main power supply and an auxiliary contact of a circuit breaker on the standby power supply; and the output contacts are respectively connected with control loops of circuit breakers on the secondary loads, a control loop of a circuit breaker on the main power supply and a control loop of a circuit breaker on the standby power supply. The invention also provides a standby power supply automatic input method with the inter-tripped loads. By the standby power supply automatic input system and the standby power supply automatic input method with the inter-tripped loads, the secondary loads can be tripped off, so that supply of the power supply on the main load is effectively ensured.