Evaporation heat exchange barrel pump skid unit

The utility model belongs to the technical field of freezing and refrigeration, and particularly relates to an evaporation heat exchange barrel pump skid unit which comprises a gas-liquid separator, a plate type heat exchange unit, a secondary refrigerant circulating barrel and an ammonia seamless cooling calandria, and a steam inlet of the gas-liquid separator is connected with a first outlet of the plate type heat exchange unit through a first pipeline. The gas-liquid separator is connected with the plate type heat exchanger unit through a backflow pipeline, the backflow pipeline is further connected with an external Freon liquid supply device, the secondary refrigerant circulation barrel is connected with the plate type heat exchanger unit through a pipeline, a liquid outlet of the secondary refrigerant circulation barrel is connected with a fourth pipeline through two branch pipes, and each branch pipe is provided with a secondary refrigerant pump. The fourth pipeline is connected with an ammonia seamless