Refrigerating unit of refrigerator car

The utility model provides a refrigerator car refrigerating unit which comprises a temperature controller, a relay board and a refrigerating unit, and the relay board comprises a single-chip microcomputer warehouse temperature sensor, a defrosting sensor, a pipeline high-voltage switch, a pipeline low-voltage switch and a pipeline medium-voltage switch. The refrigeration unit comprises a compressor, a liquid storage tank, a condenser, a condensation fan, an oil separator, an air suction pressure regulating valve, an evaporator, an evaporation fan unit, an expansion valve, a drying bottle, a defrosting electromagnetic valve and a stop valve; the evaporation fan unit comprises at least two evaporation fans which are correspondingly distributed in different areas of the evaporator; the relay board is used for collecting the environment temperature, the defrosting temperature and the switching value in the compartment of the refrigerator car and used for independently controlling opening and closing of each conde