The present invention provides a generator state monitoring method and device, belonging to the automatic monitoring field. The method comprises: obtaining a power supply input state of a device; obtaining a power supply state of an electric supply; and determining an operation state of a generator according to the power supply input state and the power supply state of the electric supply, whereinthe generator is a standby power of a device. Through adoption of the method provided by the invention, a monitored power supply state of an electric supply and a power supply input state of a devicecan be employed to determine an operation state of a generator to realize real-time monitoring of the operation state of the generator, avoid spot investigation of a non-intelligent generator so as to save manpower and material resources while improving efficiency.