The utility model relates to a fresh -keeping device and system belongs to the storage and fresh keeping technology field. Should include by fresh -keeping device: box and chamber door, the box includes: storeroom, auxiliary engine room and control room. Indoor system nitrogen subassembly, refrigerating module, humidification subassembly and the gas way pipeline of being provided with of auxiliaryengine. Gas way pipeline includes: admission line and exhaust duct, the one end of admission line and system nitrogen subassembly intercommunication, in the storeroom was arranged in to the other end, in the storeroom was arranged in to exhaust duct's one end, the other end was provided with first solenoid valve outside arranging the box in on the admission line, the last second solenoid valve that is provided with of exhaust duct. Being provided with control module in the control room, being provided with air bag and temperature sensor in the storeroom, system nitrogen subassembly is connected with the air bag. Control module is connected with system nitrogen subassembly, refrigerating module, humidification subassembly, temperature sensor, first solenoid valve and second solenoid valverespectively. Should fresh -keeping device have taked multiple fresh -keeping technique to guarantee to store the fresh -keeping of article in the storeroom.