The invention relates to a white wine brewing technology, and discloses a temperature monitoring device and temperature monitoring system of a white wine pit. A signal acquisition front stage of the temperature monitoring device employs a lightning-prevention interface design, a data processing rear stage employs a RS485 bus with high interference-resistant capability to do data transmission, theelectromagnetic interference-resistant capability is effectively improved, and the temperature monitoring accuracy is ensured. By applying the temperature monitoring device and the temperature monitoring system to temperature monitoring of the white wine pit, the temperature change condition in the pit can be accurately mastered. The monitoring temperature and the temperature monitoring system canbe combined with a temperature control system to use, automatic monitoring of a temperature in the white wine pit is achieved, a temperature environment with a change trend of fermentation control after a slow fall is constructed, and the white wine fermentation quality is ensured.