Liquid nitrogen equipment and control method thereof

The embodiment of the invention discloses liquid nitrogen equipment and a control method thereof, relates to the technical field of oil field yield increase operation wells, and is used for realizing intelligent control of the liquid nitrogen equipment so as to reduce the operation difficulty of the liquid nitrogen equipment. The liquid nitrogen equipment comprises a storage tank; the first liquid inlet valve is communicated with the bottom of the storage tank through a first liquid inlet pipeline; the second liquid inlet valve is communicated with the top of the storage tank through a second liquid inlet pipeline; the first temperature sensor is arranged in the storage tank and used for detecting the temperature value in the storage tank; the controller is configured as follows: when the liquid nitrogen equipment needs to be filled with liquid, a first temperature value of the interior of the storage tank at a first moment is obtained through the first temperature sensor; if the first temperature value is sm