Sperm freezing device for liquid nitrogen fumigation method

The sperm freezing device comprises a freezing tank, a sealing cover is hinged to an opening in the upper end of the freezing tank, a nitrogen storage cavity is formed in the lower portion of the freezing tank, a freezing cavity is formed in the upper portion of the freezing tank, a partition layer is arranged at the position, close to the opening, of the freezing cavity, and a plurality of sliding grooves are formed in the position, below the partition layer, of the inner wall of the freezing cavity. A connecting frame is slidably connected to the portion, below the partition layer, in the freezing cavity, a plurality of sliding blocks slidably connected with the sliding grooves are arranged on the edge of the connecting frame, a plurality of containing sleeves are arranged on the connecting frame, a temperature sensor is arranged at the bottom of one containing sleeve, and a plurality of through holes corresponding to the containing sleeves one to one are formed in the partition layer. A driving motor is in