A cold room evaporator is one of the most important components of a cold storage system. A cold room evaporator is mainly composed of a heat exchange coil, an axial Fan, a liquid separator, a defrost device, and a water tray. When the cold room evaporator is operating, liquid refrigerant enters the heat exchange coil through the liquid separator. The liquid refrigerant will vaporize and absorb heat. The axial fan is responsible for the convection circulation between the fan and the air in the cold storage, so as to achieve the purpose of cooling in the cold storage.