Low temperature high humidity defrosting room is equipped with refrigeration system, heating system, humidification system and circulation system. The working principle is to use the low temperature and high humidity air to blow the products uniformly. The thawing temperature, humidity and time are controlled in stages through the PLC control system, which make the products be thawed under the environment with reasonable temperature and humidity. The low temperature high humidity defrosting room is mainly used for defrosting of frozen blocky meat. Compared with other thawing methods, the low temperature thawing room has more uniform cross-contamination and low water loss rate.