The invention discloses a safe discharging device for sorbitol hydrogenation. The safe discharging device comprises a flash tank, an evacuation device, a flash charging valve, a discharging valve, a steam adjustment valve and a pressure transmitter, and is characterized in that a steam exhaust hole of the flash tank is connected with the evacuation device through a pipeline; one hole of the evacuation device is connected with the steam adjustment valve through a steam conveying pipe; the other hole of the evacuation device is connected with an emptying pipe; the discharging valve is arranged at the bottom of the flash tank; the middle of the flash tank is connected with a material conveying pipe; the flash charging valve is arranged on the material conveying pipe; the pressure transmitter is arranged on the flash tank; the pressure transmitter is connected with a control unit through a signal line; the control unit is connected with the flash charging valve and the steam adjustment valve through signal lines. The safe discharging device and control method for the sorbitol hydrogenation have the advantages and the beneficial technical effects that hydrogen detonating sound in a sorbitol discharging process is eliminated, a fire caused by discharging hydrogen is avoided, and material leakage in the discharging process is avoided; the control method can be applied to a sorbitol hydrogenation reaction discharging device, and can also be applied to the discharging of other similar hydrogenation reaction devices.