Granary lighting device and system and control method thereof

The invention relates to a granary lighting device and system and a control method thereof, and relates to the technical field of lighting, the granary lighting device comprises a lighting lamp, a light guide optical cable and a first light source module, the lighting lamp is used for being installed in a granary, the lighting lamp comprises a shell cover, a reflection cavity and a channel communicated with the reflection cavity are defined in the shell cover, and the bottom of the reflection cavity is open; a scattering structure is arranged in the reflection cavity; the light guide optical cable is inserted into the channel, and a light outlet of the light guide optical cable directly faces the scattering structure; the first light source module is used for being installed outside the granary, connected with the light guide optical cable and used for coupling incident light into the light guide optical cable. The light source module is installed outside the granary, the light is transmitted into the granary